10科技英语的翻译

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科技英语四级词汇

科技英语四级词汇
科技英语是当前科技领域的重要语言之一。

掌握科技英语词汇对于从事科学研究、技术开发以及与科技相关的工作非常重要。

以下是科技英语四级词汇的完整版。

2. Artificial Intelligence: 人工智能
3. Robotics: 机器人技术
4. Data Analytics: 数据分析
5. Internet of Things (IoT): 物联网
6. Cybersecurity: 网络安全
7. Virtual Reality (VR): 虚拟现实
8. Augmented Reality (AR): 增强现实
10. Genetic Engineering: 基因工程
11. Biotechnology: 生物技术
12. Nanotechnology: 纳米技术
13. Renewable Energy: 可再生能源
14. Artificial Neural Network: 人工神经网络
15. Big Data: 大数据
16. Cryptocurrency: 加密货币
17. Machine Learning: 机器研究
18. 3D Printing: 3D打印
20. Space Exploration: 太空探索
这些词汇涵盖了科技领域的多个方面，帮助人们更好地理解和交流科技相关的概念和技术。

掌握这些词汇将有助于提高科技英语的水平，为从事相关工作打下坚实基础。

(注意：本文档的内容来源于科技领域常见的英语词汇，没有引用无法确认来源的内容。

)。

信息与通信工程专业科技英语翻译10

X. Third Generation Wireless Networks第三代无线网络移动通信简介电信工业面临着向用户稀少而安装固定电话网络成本很高的乡间地区提供电话服务的问题。

降低有线电话高昂基础设施费用的一个方法是使用固定无线电网络。

这一方面存在的问题是，对于乡间和城市需要由大的蜂窝单元以达到足够的覆盖。

而且由于多径传播的长时间延迟又遇到额外的问题。

目前在澳大利亚全球移动通信系统（GSM）技术正被用于农村地区的固定无线电话系统。

然而GSM使用时分复用（TDMA），这种技术的符号速率很高，会导致多径引起码间干扰的问题。

人们正在考虑用于下一代数字电话系统的好几种技术，目的是改进蜂窝单元的容量、抗多径干扰以及灵活性。

这些技术包括CDMA和COFDM，这两者都能用于向农村提供固定无线系统。

不过每一种技术有不同的性质，分别适用于特定的应用。

COFDM目前正用于一些新的无线广播系统包括高清晰度电视（HDTV）提案和数字音频广播（DAB），而对COFDM作为一种移动通信系统的传输方法却研究甚少。

在CDMA中所有用户在同一频带中传输，他们用特殊的码实现信道化。

基站和移动站都知道用于调制发送数据的码。

OFDM/COFDM通过将可用带宽分成许多窄带载波使许多用户能在给定的频带内发送信号。

每个用户分配到若干载波在其中发送数据。

传输以这样的方法进行：载波之间相互正交因而它们可以被安排得比标准得频分复用（FDM）拥挤得多，这就使OFDM/COFDM有很高的频谱使用效率。

第三代无线网络数字网络使用的扩展已经导致了设计大容量通信网络的需要。

在欧洲，蜂窝型系统到2000年的需求预计将达到1500至2000万户，而美国（1995年）已经超过了3000万户。

无线通信服务正以每年50%的速度增长，目前的第二代欧洲数字系统（GSM）预期在21世纪初达到饱和。

随着广泛的业务需求如视频会议、互联网服务、数据网络、多媒体等的发展，电信工业也在变化之中。

研究生科技英语阅读课文翻译(1-10).

Unit 1 Genetically modified foods -- Feed the World?If you want to spark a heated debate at a dinner party, bring up the topic of genetically modified foods. For many people, the concept of genetically altered, high-tech crop production raises all kinds of environmental, health, safety and ethical questions. Particularly in countries with long agrarian traditions -- and vocal green lobbies -- the idea seems against nature.如果你想在某次晚宴上挑起一场激烈的争论，那就提出转基因食品的话题吧。

对许多人来说，高科技的转基因作物生产的概念会带来诸如环境、健康、安全和伦理等方面的各种问题。

特别是在有悠久的农业生产传统和主张环保的游说集团的国家里，转基因食品的主意似乎有悖自然。

In fact, genetically modified foods are already very much a part of our lives. A third of the corn and more than half the soybeans and cotton grown in the US last year were the product of biotechnology, according to the Department of Agriculture. More than 65 million acres of genetically modified crops will be planted in the US this year. The genetic is out of the bottle.事实上，转基因食品已经成为我们生活重要的一部分。

科技英语课文句子翻译Unit1-10

Sentence TranslationUnit 1Text A1.However, the volume of business done on the Internet is growing rapidly, as people orderbooks and other products to make money transactions.但是，因特网上的交易数量急速增长，人们从网上购书和其他的产品，进行资金交易。

2.They use them to prowl the Internet, looking for ways to break into computers systems runby banks, telephone companies and even government departments.他们用电脑上网，寻找能够进入银行电脑系统、电话公司的电脑系统、甚至是政府的电脑系统的方式。

3.The first indication of a security breach may be when a customer discovers a fraudulentmoney transaction on a credit card account.当顾客发现信用卡的帐号上出现了来历不明的消费时，这可能就是安全受到了破坏的第一个标志。

4.The use of credit cards to buy things on the Internet converts the issue of Internet securityinto one of general security.用信用卡在网上购物使网络安全变成了大众所普遍关注的安全的一种5.Few people think twice about giving a credit card number over the phone and many areequally careless about what happens to the carbon copy when completing a transaction over the counter.很多人会在电话里随意报出自己的信用卡号码，同样地，也有很多人不留意交易完成后放在银行柜台上的副本。

科技英语的特点与翻译

科技英语的特点与翻译一、科技英语的特点科技英语（English for science and technology，EST）指与用于科学和技术交流方面的英语口语和书面语。

作为一种重要的英语语体，其特点主要体现在以下几个方面。

1、词汇方面大量使用专业词汇、复合词、缩略词及利用前后缀构成的派生词。

专业词汇意义专一，用来表示明确的含义。

科技词汇多源于希腊语和拉丁语，是因为这两种语言作为英语的重要来源，是世界上成熟最早和最完备的语言中的两种，词汇不再发生词形、词义上的变化，具有稳定性。

2、句子方面多使用长句和被动语态，大量使用名词化结构（nominalization）和非限定动词。

另外，各种成份（如介词短语、形容词及其短语、副词、分词及从句等）作定语并后置，多使用It…that…结构句型、被动结构句型、as结构句型、分词短语结构句型和省略句结构句型等常用句型。

名词化结构有利于行文简洁、表达客观、内容确切，也可使所含信息量增大，尤其是科技英语强调存在的事实，而非个别行为。

不定式短语、-ing分词短语和-ed分词短语这三种非限定动词形式具有齐备的语法功能，可代替各种从句，这样既可缩短句子，行文简练，结构紧凑，又比较醒目。

3、形态方面科技英语在时态运用上有限，多用过去时和现在时。

尤其是多用一般现在时，以表述无时间性的科学定义、定理、公式、现象、过程等。

另外，科技英语多用逻辑性语法词（logical grammatical operators），如表示原因的如because (of)、due (owing) to、as (a result of)、caused by、for等，表示语气转折的如but、however、nevertheless、otherwise、yet 等，表示逻辑顺序的如so、therefore、thus、furthermore、moreover、in addition to等。

4、文体方面科技英语注重行文的连贯（coherence）、清晰（clarity）、流畅（fluency），避免行文晦涩、表露个人感情、过多运用修辞手法等。

科技英文翻译方法

➢ well-known
carbon steel
rust-resistance
by-product
atomic weight
periodic table
acid ionization constant
activization energy
common ion effect
rate of a reaction
科技英语的教学目的
◆ 词汇★（构词法、词头、词尾、缩写词词汇的构成） ◆ 阅读与翻译★（较熟练地阅读和翻译英文化学文献） ◆ 写作（论文英文摘要和简单综述） ◆ 听、说能力
科技英语翻译基础
➢ 一、简介 ➢ 二、单词译法 ➢ 三、词类转换的译法 ➢ 四、句子成分转换的译法 ➢ 五、词序转变的译法 ➢ 六、被动语态 ➢ 七、后置定语 ➢ 八、长句（难句）
Ø Acids react with certain metals to produce hydrogen. Ø A mixture of nitrogen and hydrogen forms ammonia in
the reaction. Ø Silver hydroxide is easy to break down into the oxide
科技英语的语法特点
3. 复杂长句多
科技文章要求叙述准确，推理严谨，英语句子往往很长，必须按照汉语习惯翻译成若干简单句。
ØObjectionable hydrogen sulfide is removed from such a gas or from naturally occurring hydrocarbon gases by washing with various alkaline solutions in which it is absorbed.

科技英语的翻译(汉译英)

科技英语的翻译

问题： those on chromosomes表示染色体的减少效应，而不是染色体上的基因的减少效应。我们要的是后者的意思。所以要写成those of genes。 Reduction effects是指粒重的减少效应，而不是 genes on chromosomes的减少效应，所以要加上on grain weight。改译为: The reduction effects of genes on chromosomes 1B and 2B on grain weight were obviously higher than those of genes on chromosomes 5A, 6B, 2D and 7D.

科技英语的翻译
例
2 The division frequency of protoplasts was lower in the liquid medium than that embedded in the medium containing agarose. 原生质体在液体培养基中的分裂频率低于包埋在含有琼脂糖的培养基中的分裂频率。
科技英语的翻译
例
2 Owing to these changes of basic equilibrium state, with the result that the basic characters of dynamics will be changed.
由于这些基本的平衡的变化，将导致动力学基
科技英语的翻译
问题：两句是主从关系句。改译为: The total area under natural protection reaches 19,330, which accounts for 2.1% of the total area of China.

科技英语课文翻译及课后答案

第一单元自动化第二部分阅读A自动化的含义“自动化”已经是，而且现在仍然是，一个被大量滥用的词。

但是，人们对其确切的意义以及所包括的内容，正在逐渐地有了较为正确的了解。

如果不是下一个定义的话，我也许可以尝试作些解释，把自动化说成是一个概念。

运用这个概念，人们通过对机器装置的性能进行充分的测量、观察和控制，从而使其以最高的效率运转。

这需要对这种装置的功能有一个详细而连贯性的了解，以便需要时便能运用最佳的矫正操作。

自动化按其确切的意义，只有全面运用通信、计算和控制三个主要组成部分（“三C" )才能完全实现。

我认为，确保人们对合为一体的三个组成部分对我们的社会所蕴含着的某些意义有所认识和了解，是很有必要的。

首先，我们不妨考虑工业部门之一的炼钢工业。

在炼钢工业中，自动化已经开始成型。

到过钢厂的人都会知道从高炉开始的各种工艺流程的一些情况，成品条钢或板钢生产出来之后，再准备送往制造工艺车间或汽车厂，这些工艺流程是相互链接的。

为了使工厂中各个车间充分发挥效率，可以使用计算机来控制每个车间。

在此之前，计算机工作所需要的一切资料均输入机内。

就高炉来说，需要给计算机提供装人高炉的原料的信息、高炉工作温度的信息和处理各种各样配料的最好方法等方面的资料。

钢厂的高炉操作是一项复杂而要求技术熟练的作业，需要大量的知识和大量的综合信息，并迅速地做出判定选择，以便确保高炉工艺流程中的下一阶段的有效工作。

计算机对所有这一切都了解得很透彻，能够做出非常大量的中间判定，并且能够把全部信息立刻和不间断地提供给管理人员，以使他们做出高效管理这个工厂所需要的最后决定。

由此产生的信息数据和判定要进行处理，然后转送到下一个工序。

在这里，对操作的一些专门细节再次进行整理，提出最佳和最终的判定，然后对这些信息再一次进行处理并输送给下一道工序。

同时，当信息数据从生产单元的一道工序输送到下一工序并完全结合成为一项新的操作时，每次变化的结果反馈到最初阶段，而且，不断地做进一步的调整，结果是整个工厂的工艺流程便能够高效率地进行下去。

科技英语入门课文翻译及单词总结

Unit onemilitary军事的，军用的geometry几何学trigonometry三角学algebra代数学variable quantity变量proposition命题postulate假设．假定electromagnetism电磁学Unit TwoVirtualization虚拟Unit Threeconfiguration配置topology拓扑学interoperability互操作性Unit fouranalog electronics 模拟电子技术transistor双极型晶体管amplification放大semiconductor半导体current 电流bipolar 双极型emitter(E) (晶体管的)发射极base(B) (晶体管的)基极collector(C) (晶体管的)集电极switch 开关voltage 电压gain 增益saturated饱和的load 负载grid（G）（MOS管的）栅极drain（D）（MOS管的）漏极source（S）（MOS管的）源极enhancement MOS transistor增强型金属氧化物半导体(MOS)晶体管MOS (Metal-Oxide-Semiconductor) exhausted MOS transistor耗尽型金属氧化物半导体(MOS)晶体管bias circuit 偏置电路operational amplifier circuit运算放大电路rectification整流regulation稳压DC power supply 直流电源mother board主板，母板wafer 晶片integrated circuit(IC) 集成电路package 封装pin 引脚stripboard 条形焊接板breadboard 面包板anti—clockwise 逆时针方向notch凹槽solder 焊接heat sink 散热片chip holder 芯片插座screwdriver 螺丝起子Unit Fivedigital logic circuit 数字逻辑电路high level 高电平low level 低电平rectangular wave方波digital electronics 数字电子技术decimal 十进制binary 二进制octal 八进制hexadecimal十六进制algebra 代数学variable 变量gate门电路combinational logic circuit组合逻辑电路encoder 编码器decoder 译码器data selector 数据选择器numeric comparator 数值比较器parity checker奇偶校验器output expression 输出方程flip-flop 触发器sequential logic circuits时序逻辑电路register 寄存器counter 计数器driving equation 驱动方程state equation 状态方程sequential chart 时序图civil 民用的military 军用的D-FF(D-flip-flop) D触发器trigger 触发positive edge 上升沿asynchronously异步地simultaneously同步地frequency division 分频arbitrary任意的cascade 级联Unit Seveninformation 信息waveform 波形pulse 脉冲amplitude 振幅，幅度phase 相位，位相modulation 调制，调整，调节demodulation 解调detection 检测carrier 载波trapezoidal梯形的envelope 包络index 指数over-modulation 过调制baseband 基带analog 模拟sample 取样digitize 使(数据)数字化（黑体要求拼写其余要求面熟----WZQ）Unit Two Passage AComputer Problem SolvingThe hardware of虽然一部计算机的硬件能够被使用,但是没有组成电脑软件的程序就不能做任何事情. It’s crucial to understanding how software works in a modern computing system.。

科技英语动词的翻译

immediately. ▪ 如果仪器有损坏现象，请立即向承运者提出索赔要
求。
▪ Be very careful when you take antibiotics.
▪ 使用抗菌素时，请务必当心。
▪ 科技英语中还有一些用动词原形开头的句子，它们并不表示祈使语气，只是一种习惯表达方式，往往含有条件意味，翻译时要视情况加词。
inversely as the resistance. ▪ 电流的变化与电动势成正比，与电阻成反比。 ▪ A pipeline across the desert may cost as much as ￡80,000 per
mile. ▪ 穿越沙漠的输油管道，造价高达每英里八万英镑。 ▪ The article aims at discussing recent trends in naval gun design. ▪ 本文的目的是讨论舰炮设计的新趋势。 ▪ Boiling point is defined as the temperature at which the vapor
▪ Do not leave dead batteries in the battery-
box as this may cause malfunction. ▪ 注意不要将废电池留在电池盒内，以免引起故障。
▪ Should the instrument show any signs of
damage, file a claim with the carrier
▪ The range of the spectrum in which heat is radiated mostly lies within the infrared portion.

《科技英语翻译》课程练习十

《科技英语翻译》课程练习十答案一、翻译以下句子，注意长句的处理1) It is no longer possible to allow the development of the full potentialities of the new metals to evolve over a period of about fifty years, as was the case with aluminum, in the period between 1890 and 1949.译文：铝的潜力全部开发出来耗费了从l890到1949年大约50年的时间，而现在要把新金属的潜力全部开发出来则再也不需要50年那么漫长的时间了。

(本句中，主句部分“It is no longer possible to…”使用了一般现在时描述客观事实，而从句“as was the case with aluminum”使用一般过去时陈述在过去发生的情况。

)2) Since the outbreak of SARS in south of China late last year nearly 600 people have died and more than 7,600 have been infected．More than half the deaths have occurred in China, the world’s worst affected country.译文：自从去年年末SARS在中国南部爆发以来，全世界已经有将近600人死亡，受其感染者超过7600人。

超过半数的死亡案例发生在中国，这是全世界最受其害的一个国家。

(此句中的谓语动词均使用了现在完成时，因为虽然事情是发生在过去，但是与现在有着直接的联系，而且影响较大。

)3) As the Internet pipeline is upgraded, the availability of broadband service will expand beyond major metropolitan areas, significantly reducing the costs of access.译文：由于因特网通道升级，宽频服务的有效性将会超过主要大城市的范围，大大地降低访问的费用。

科技英语课本学习知识句子翻译Unit10

科技英语阅读课文翻译最新修订版

科技英语阅读1-9单元译文：Unit 1罗素悖论的提出是基于这样的一个事例：设想有这样一群理发师，他们只给不给自己理发的人理发。

假设其中一个理发师符合上述的条件，不给自己理发；然而按照要求，他必须要给自己理发。

但是在这个集合中没有人会给自己理发。

（如果这样的话，这个理发师必定是给别人理发还要给自己理发）1901年，伯特兰·罗素悖论的发现打击了他其中的一个数学家同事。

在19世纪后期，弗雷格尝试发展一个基本原理以便数学上能使用符号逻辑。

他确立了形式表达式（如：x =2）和数学特性（如偶数）之间的联系。

按照弗雷格理论的发展，我们能自由的用一个特性去定义更多更深远的特性。

1903年，发表在《数学原理》上的罗素悖论从根本上揭示了弗雷格这种集合系统的局限性。

就现在而言，这种类型的集合系统能很好的用俗称集的结构式来描述。

例如，我们可以用 x代表整数，通过n 来表示并且n大于3小于7，来表示4，5,6这样一个集合。

这种集合的书写形势就是：x={n：n是整数，3<n<7}。

集合中的对象并不一定是数字。

我们也可让y={x：x是美国的一个男性居民}。

表面上看，似乎任何一个关于x的描述都有一个符合要求的空间。

但是，罗素（和策梅洛一起）发现x={a：a不再a中}导致一个矛盾，就像对一群理发师的描述一样。

x它本身是在x的集合中吗？否定的答案导致了矛盾的出现。

当罗素发现了悖论，弗雷格立即就发现悖论对他的理论有致命的打击。

尽管这样，他还不能解决这个问题,并且上世纪有很多的尝试，去解决这个问题（但没有成功）。

罗素自己对这个悖论的回答促进了类型理论的形成。

他解释说，悖论的问题在于我们混淆了数集和数集的集合。

所以，罗素介绍了对象的分级系统：数、数集、数集的集合等等。

这个系统为形式化数学的形成奠定了基础，至今它还应用于哲学研究和计算机科学分支。

策梅洛对于罗素悖论的解决方法用新的公理：对于任意公式A（x）和任意集合b，都会有一个集合满足y={x：x既在b中又满足A（x）}取代了以前的公理：对于任意公式A（x），都会有一个集合满足y={x：x满足A（x）}。

科技英语翻译unit10

第十单元寻找生命课文A天体生物学到目前为止我们还没有人见过外星生物，对于天体生物学来说这似乎是个问题。

但在过去的20多年中，科学家们已经发现了一些蛛丝马迹，显示宇宙间生命或许并不罕见。

许多科学家充满希望，认为不久将能找到外星生命的有力证据。

其中的一些线索来自陆地生命。

生物学家们发现了多种嗜极生物，即可以在极端环境（如碱性湖泊和地下深处的岩石缝隙）中蓬勃生长的微生物。

生命可能起源于海底的地热口或火山口附近，这可能是其他行星和卫星的共同特点。

在陨石撞击地球并造成晚期宇宙大爆炸之后不久，在地球的岩石中出现了新陈代谢活动留下的化学痕迹，这意味着生命的起源或许是个快速、简单的过程。

来自火星的陨石不时地撞击地球。

尽管面临着低温和强烈的辐射，陨石上的细菌及其孢子很有可能在这种空间之旅中存活下来，这意味着原始生命有可能一度被太阳系的行星携带到四面八方，这一理论被称为胚种论。

火星微生物1996年，有一组科学家声称一颗代号为ALH84001的火星陨石含有火星的化石纳米细菌。

虽然他们的多数证据已被证实并不可信，但对此持有怀疑的人也无法充分解释在ALH84001号火星陨石中为什么会有磁晶体，因为它们与地球细菌产生的晶体十分相似。

虽然火星曾一度被认为是个干燥、贫瘠的星球，但来自欧洲航天局的火星特快飞船、美国国家航空航天局的月球车以及“勇气号”和“机遇号”火星车的最新证据表明，火星表面或接近表面的部分有液体水存在的迹象。

看来数十亿年前火星曾有过一段短暂的温暖、湿润的时期，甚至在今天火星表面仍可能不时有水流动。

也许火星表面以下存在一个更适于微生物栖身的“港湾”，因为那里永久存在着液态水，而且危险的太阳紫外线辐射也无法穿透表层照射到那里。

最近还发现在火星大气中存在着甲烷，这可能是生活在深层的细菌产生的副产品。

科学家已制定了一系列计划来寻找更明确的生命迹象，其中包括制造新的飞船以取代失踪的比格II号，并最终完成美国太空取样重返地球的宏伟计划。

科技英语翻译10篇

Teach Predictions for 20101. Finally, Apple Unveils the TabletOfficially, Apple has never said a word about making a tablet computer. Yet for months, everyone in tech has been talking and writing and arguing about the Apple tablet as if it's already here. The product has already received more press than most products that actually exist. Bloggers debate its faults and flaws, its strengths and Shortcomings--such is life in the weird and wonderful world of Apple. And this does not happen by accident. Apple orchestrates this stuff. It did the same thing with the iPhone, remember? For a year before the prodtict was unveiled, rumors circulated and fake prototype photos popped up all over the place. Ifs all about creating hype, and wrapping a product in a cloud of mystery and drama, so that by the time you do unveil it people are dying to buy it just tosee what all the fuss is about.The great thing about Apple, however, is that usually the products live up to the hype. Certainly the iPhone has. Arguably, it is the single most important tech product of the past decade. Will the tabletbe as profound? We think it will be. Amazon's Kindle has pioneered the market for a portable reading device. But Kindle is far from perfect. Our bet is that Apple enters this space the way it did with the iPod and iPhone: it lets others do the pioneering work and make all the mistakes, then comes along with a product that blows the predecessors away. Better design. Better build quality. Better service. And a user interface experience that’s light years ahead of everyone else's on the planet.2. Murdoch Pulls out of GoogleThe biggest, most powerful, and once-thought-to-be indestructible print media outlets have arrived at their moment of reckoning. For a decade, the likes of the Los Angeles Times, The Washington Post, and The New York Times (not to mention innumerable other oudets), have offered up their best work on a silver, online platter-- for free. Look at where it got them. The first is in jeopardy of closing up shop, the Post has shuttered its domestic bureaus, and the Gray Ladys just eliminated some 100 newsroom jobs, the second such move in two years. Enter Rupert Murdoch, theoutspoken Aussie head of News Corp whose empire spans from the Times of London to the most august business publication in the United States, The Wall Street Journal. For months now, he has been ranting about the free consumption of news online. His radical idea? Murdoch wants to stop Google from indexing his sites, and he wants Microsoft to pay for the privilege instead. In other words, he wants someone to pay for the stuff his journalists produce.A chorus of bloggers is crying that the old man's thinking cuts against the force of history--namely, that information wants to be free, and that any future-minded company ignores that fact at its peril. Techdirt says the news baron is a hypocrite. Boing Boing says Murdoch's threat to block searches and shroud his sites with paywalls is nothing more than a bluff. Think again. This isn't a doddering old coot who doesn't get the Web. Murdoch is a savvy business-man who just might lead an industry back into the reality-based community. With billions in cash on hand, he can afford short-term losses as his properties experiment with strategies that do not involve the essential untenability of giving the product away. And once he proves that a news publication can poke Google in the eye and survive, others will follow suit. After all, if they don't, Murdoch may be the only one left standing.3. Malw Disrupts FacebookWhen it comes to malware, the law of gravity is this: the bad guys go where the money is. That's why threats to computer users have evolved from viruses to botnets and phishing attacks--each iteration is more likely to produce profit. How does a piece of malware make money, exactly? In a number of ways, from rifling through your files for bank-account information and credit-card numbers, to turning your computer into a spam factory. The follow-the-money rule also helps explain why there aren't many threats for *Mac computers. They may have some security advantages over PCs, but mostly their market share isn't big enough to be worth malware creatorg time. )It follows that as we conduct more of our lives online, malefactors will follow us there. And where is the biggest action on the Web today? Facebook, which just signed up its 350 millionth user and shows no sign of slowing down. Facebook has seen malware before; the latest threat is an especially virulent edition of the "Koobface" worm that has bedeviled the social network for months. It's going to get worse from here. Facebook has a team of smart engineers dedicated to keeping malicious activity off the site, but with the network ballooning in size, they'll need to redouble their defenses in even greater proportion.4. Starbucks Will Stalk YouPrivacy is so passe. We've become addicted to broadcasting our lives to the world, and the mobile phone is our greatest enabler. That's especially true now that GPS is a standard feature. And today's hottest startups are racing to become the ankle bracelet of choice, doing everything they can to track our every move and indulge our shout-it-from-the-rooftops exhibitionism. Location-aware services like Foursquare, which awards points every time you check into a bar or restaurant, have become staples among the early-adopter crowd. Meanwhile, Twitter6 has added geolocation to its service, meaning each tweet is like a thumbtack on the map of your daily travels. Rumors have it that Facebook, with its 350 million users, is heading in the same direction. It's only a matter of time before advertisers follow. You can almost hear the screams of joy coming from marketing departments nationwide: soon companies will be able to target their ad campaigns based not just on who you are, but where you are. Passing by a Starbucks? Your phone just offered you 10 percent off a peppermint latte!5. Movie Downloads Stall Blu-rayBlu-ray may have won the war with its rival, HD-DVD---but does anyone care? While consumers were waiting for the two formats to duke it out--nobody wanted to plunk down several hundred bucks on a losing technology--they discovered that downloading movies to their homes has matured into a great way to watch their favorite titles. A Harris Interactive poll in June found that only 7 percent of consumers without Blu-ray players planned on buying one in the next year. Whafs holding back a format that everyone agrees is showstoppingly gorgeous to watch? Money is a big part of it, of course. Getting video over the Internet through iTunes9 or Amazon Video on Demand can be much cheaper than purchasing physical copies. Sometimes the value is truly insane: all it costs to binge out on seasons one, two, and three of Friday Night Lights is $ 8.99. That's the price of the cheapest monthly subscription to Netflix, which allows unlimited streaming of some shows and movies to your PC, or to your big screen if you own an Xbox 360, PlayStation 3, newer TiVo, or a similar device,Yes, a Blu-ray disk provides better quality picture and sound. But as Wired magazine argued in a recent cover story, consumers are enjoying a "Good Enough Revolution" : we're nuts about MP3s, even if they sound kind of crappy, and we can't watch enough YouTube clips, even though they're pixellated and choppy. The feverish pursuit of top quality is no longer our only concern. Sometimes convenience matters more.6. Your Phone Replaces Your WalletDuring its most recent pledge drive, the popular public-radio program This American Life followed a familiar script, exhorting its users to chip in $10, $ 5, even just $1, to help pay for its weekly broadcast. The pitch wasn't new, but one of the payment methods was instead of heading to your computer and entering your credit-card information, you could simply send $ 5 to the show via text message. Long promised, never realized, mobile payments will finally take off in the U. S. in 2010. Already the sector is a beehive of activity, with companies like Zong and mPayy enabling cus tomers to pay for online purchases with only a phone number. Obopay, another mobilepayments company, received $ 35 million from Nokia in 2009, and it will have a wide rollout on that company's phones. Perhaps the best sign that the sector is poised for takeoff is that Twitter creator and tech superstar Jack Dorsey has set his sights on it. His new company, Square, launched in December, allows merchants to accept credit-card payments with cell phones. True, Square doesn't untether us from plastic just yet, but it's only a matter of time before "Cash or credit?" becomes "Cash or cell?"7. Facebook Goes PublicAt only 25 years old, Facebook's Mark Zuckerberg has turned his donn-room idea into a global empire. Might he identify with Alexander the Great, who wept at the size of his dominion because there were no more lands left to conquer? Not just yet: he can still take the company public. In November, the social-networking company took a major step toward that event by announcing that it was creating two classes of stock: one class suitable for sale in an initial public offering, and one that is vested with 10 times the voting power. An IPO under those conditions would flood the company with cash while keeping control firmly in Zuckerbergs hands. If that sounds familiar, it's because the strategy is the same one used by Google before it went public in 2004. Zuckerberg is as cutthroat and super-ambitious as he is socially awkward that is to say, very--and he would stand to become an actual billionaire, not just a virtual one. His Personal wealth has yo-yo'd in line with various private valuations of his company over the years. Facebook also announced this year that it is cash-flow positive, and a successful IPO would cement the site as a viable business, while archrival Twitter stillscrambles for a business model.8. Twitter Use FlatlinesTwitter is almost synonymous with explosive growth. But there are signs that 2009's darling of the Internet has already begun to level off, a reversal that would have seemed impossible not long ago. In February 2oo9, Nielsen Online reported that Twitter's 7 million unique visitors constituted more than 1,000 percent growth in just a year's time. Ashton Kutcher, after beating CNN to the million-follower mark in a neckand-neck race, began blasting past later milestones with ease. (He's now at 4.1 million followers. ) And when Oprah Winfrey embraced the service in April, Twitter's popularity simply hockey-sticked.There were skeptics all along-- Nielsen also reported last spring that 60 percent of Twitter users failed to return after one month but excitement about the new mediurm's potential made them easy to dismiss. Now the data have become difficult to ignore. Twitters U. S. traffic actually declined from September to October, according to a range of measures. We're by no means Twitter haters--here's proof--but it seems clear that the service is in for a period of modest performance, as sign-ups of new users are measured against better estimates of existing users who neglect their accounts. One of the things that has made Twitter so successful is its wide-open API; ironically, that same transparency can provide a reality check on the number of people who have let their accounts go totally dormant who began tweeting during the Oprah bubble, but turned out to be making just a short stop at the birdbath.9. Microsoft Pushes Out Steve BallmerBallmer's 10th anniversary as CEO of Mierosoft arrives in January, but ifs hard to imagine he'll be celebrating. Mierosoft stock has dropped by nearly 50 percent on his watch, lagging not just other teeh eompanies but even the Dow Jones industrial average. Distracted by the Windows Vista fiasco, Ballmer has missed every big new tech market of the past decade. Google won the race for Internet search and keyword advertising. Apple won in MP3 players and online music sales, and now holds the high ground in mobile phones, while Windows Mobile fades away. Microsoft's Zune music player is a dud. Bing, Microsoft's search engine, will never catch Google. Ballmer is said to be a brilliant guy, but he got a black eye for the way he blundered and blustered and finally botched an attempted acquisition of Yahoo. He's a screamer and a bit of a bully--not the easiest guy to work for. If Microsoft were any other company, this guy would be in trouble. But the catch is, Ballmer was put into the job by Microsoft founder Bill Gates, and the two have been pals since their undergraduate days at Harvard. If Gates wants to get rid of Ballmer, he' 11 have to craft some kind of graceful exit that lets his buddy save face. Another problem: there's no heir apparent on the management team. Nevertheless, investors must be getting restless. Soon they'll start calling for a shake-up.10. Google Faces Antitrust SuitThe Feds are already looking at Google on a variety of fronts. Its deal with book publishers has drawn scrutiny. In 2009 it was hassled by the Federal Trade Commission over possible anticompetitive connections because it shared two board members with Apple, a situation that got resolved when Google CEO Eric Schmidt quit Apple's board, and Arthur Levinson, an Apple board member, quit the Google board. Regulators freaked out again when Google tried to make a search partnership with Yahoo. Supposedly the Feds were ready to bring charges, but then Google walked away from the deal.After facing this scrutiny in the past year, Google has launched a kind of ongoing publicity campaign, wooing the media and hoping to convince people that it isn't really a big bad company. It likes to say that it's operating in a highly competitive field and that its users can leave with the click of a mouse. But the fact is, Google handles two thirds of all searches in the United States. Whether that can legally be defined as a "monopoly" and whether Google can be shown to have abused its powerful market position remains to be seen. But regulators here and/or in the European Union will find Google so tempting a target that they will not be able to resist bringing a case to find out.Addicts of the Information AgeAmong everybody from our leaders to our teenagers, no habit is spreading faster than being connected 24/7 via a smart phone.[2] Its penetration in the U.S. is estimated at 18%, and it seems that everywhere you turn, people are using their smart phones in new ways and in new places. Samsung recently estimated that it expects 500 million global smart-phone users by 2012. Actual phone calls are becoming extinct compared with handheld texts and email messages--whoever thought people would prefer typing to talking? But the evidence appears to say they do.[3"] This has also given rise to a group of people--the top 10% of smart-phone users--who just can't stop. They are the smartphoniacsI, the true addicts of the information age.[4] Here are five tell-tale2 traits of Smartphoniacs :Do they take their smart phones with them when they get up from the table to go to the restroom---and do they take an awful lot of trips there?Do you receive messages from them while you know they are driving (increasingly being harmed in state after state), or at midnight on Saturday night?Do they come up with excuses in the middle of a conversation to pull out their smart phone--something like "let me jot something you said down so I don't forget it", and then sneak a look at all their messages?Are they suffering from sprained or elongated thumbs?Do they openly use their smart phones in inappropriate places, such as first dates, at Rosh Hashanah4 or Christmas dinner, in hospital delivery rooms, or on job interviews?[5 ] If your "friend" fits four out of five of these, then he or she is a smartphoniac. If he fits only two or three of them, he is just another typical user who stays connected on the street, in meetings and at the movies.[6] As these devices pop up everywhere, there has been a recent spate of articles about smart-phone "manners"--as if using your phone when your boss, or your mother, is talking to you is just a matter of poor training on their part. I don't think your boss or your mom ever said "go ahead, text while I'm talking to you". So it's just not a matter of manners. Ifs much more the result of a deeper disconnect anxiety, an irrepressible fear that you will miss something if you put it away.[7] I once worked with a candidate for Senate who emailed me from the podiums during a debate. Many 'CEOs communicate today primarily from their smart phones. Hillary Clinton and Barack Obama used them on the campaign trail, while John MeCain didn't.[8] The famed red phone to call the Russian premier in the event of a national security emergency could now be replaced by a red smart phone. Imagine if the world's top leaders were all connected bysmart phones and they communicated directly and frequently about issues of mutual concern. It would revolutionize diplomacy.[9] But Smartphoniacs are an eclectic mix of the successful and powerful, busy professionals, teenagers and college students. All of them commtmicate incessantly.[10] In Korea, more than three in 10 youths who carry mobile phones are said to be addicted. In Germany, there are an estimated 380,000 texting addicts—folks who withdraw from the very family and friends their machines were supposed to connect them to. While there hasn't been a formal study of Smartphoniacs in America, we know that between the second quarter of 2007 and the second quarter of 2008, the North American smart-phone market grew 78.7%. About 139.3 million smart phones were sold world-wide last year, and half of U. S. smart-phone users report using their devices more today than they did just three months ago.[11] Last month, the National Texting Championship award and its $ 50,000 grand prize went to a 15-year-old who texts 500 times a day. A recent poll found that 42% of teens can text with their eyes closed. And based on other studies on the intensity of smart-phone use, we can guess that Smartphoniacs skew male, affluent and well-educated. Not since the television has any invention changed the lifestyle habits of Americans more than the smart phone. The recent movie Seven Pounds detailed the guilt of an executive who caused a fatal car crash because he emailed while driving.[12] To be sure, there are forces calling for temperance7. Some people refuse to date people who use smart phones. Many parents just say no. Legislators are getting into the act to protect public safety. But for the most part, Americans of every age and stage are wrapping themselves in apps, chcks and instantaneous communication as part of a social network. And some small but significant percentage of this group is going to take a one-way slide to the bottom, where the compulsion to use their smart phones is so strong that they can only hope their batteries last long enough to text a cry for help.[13] We're not far away from Smartphoniacs Anonymous or Mothers Against Smart Phones. We've been through this with TV, the Intemet and videogames. In the end it all works out and we successfully integrate them into our lives, even though we are never again the same. At least with smart phones, with all their usage counters, we will be able to tell who has recovered from the binges.。

科技英语原文及简单翻译

科技英语原文及简单翻译How ASIMO WorksIntroduction to How ASIMO WorksWant a robot to cook your dinner, do your homework, clean your house, or get your groceries? Robots already do a lot of the jobs that we humans don't want to do, can't do, or simply can't do as well as our robotic counterparts.Honda engineers have been busy creating the ASIMO robot for more than 20 years. In this article, we'll find out what makes ASIMO the most advanced humanoid robot to date.The Honda Motor Company developed ASIMO, which stands for Advanced Step in Innovative Mobility, and is the most advanced humanoid robot in the world. According to the ASIMO Web site, ASIMO is the first humanoid robot in the world that can walk independently and climb stairs.Rather than building a robot that would be another toy, Honda wanted to create a robot that would be a helper for people -- a robot to help around the house, help the elderly, or help someone confined to a wheelchair or bed. ASIMO is 4 feet 3 inches (1.3 meters) high, This allows ASIMO to do the jobs it was created to do without being too big and menacing.ASIMO's Motion: Walk Like a HumanHonda researchers began by studying the legs of insects, mammals, and the motion of a mountain climber with prosthetic legs to better understand the physiology and all of the things that take place when we walk -- particularly in the joints. For example, the fact that we shift our weight using our bodies and especially our arms inorder to balance was very important in getting ASIMO's walking mechanism right. The fact that we have toes that help with our balance was also taken intoconsideration: ASIMO actually has soft projections on its feet that play a similar role to the one our toes play when we walk. This soft material also absorbs impact on the joints, just as our soft tissues do when we walk.ASIMO has hip, knee, and foot joints. Robots have joints that researchers refer to as \degrees of freedom.\A single degree of freedom allows movement either right and left or up and down. ASIMO has 34 degrees of freedom spread over different points of its body in order to allow it to move freely. There are three degrees of freedom in ASIMO's neck, seven on each arm and six on each leg. The number of degrees offreedom necessary for ASIMO's legs was decided by measuring human joint movement while walking on flat ground, climbing stairs and running.ASIMO also has a speed sensor and a gyroscope sensor mounted on its body. They perform the tasks of:? ?sensing the position of ASIMO's body and the speed at which it is moving relaying adjustments for balance to the central computer These sensors work similarly to our inner ears in the way they maintain balance and orientation.ASIMO also has floor surface sensors in its feet and six ultrasonic sensors in its midsection. These sensors enhance ASIMO's ability to interact with its environment by detecting objects around ASIMO and comparing gathered information with maps of the area stored in ASIMO's memory.To accomplish the job our muscles and skin do in sensing muscle power, pressure and joint angles, ASIMO has both joint-angle sensors and a six-axis force sensor.Unless you know a lot about robotics, you may not fully grasp the incredible milestone it is that ASIMO walks as we do. The most significant part of ASIMO's walk is the turning capabilities. Rather than having to stop and shuffle, stop and shuffle, and stop and shuffle into a new direction, ASIMO leans and smoothly turns just like a human. ASIMO can also self-adjust its steps in case it stumbles, is pushed, or otherwise encounters something that alters normal walking.In order to accomplish this, ASIMO's engineers had to find a way to work with the inertial forces created when walking. For example, the earth's gravity creates a force, as does the speed at which you walk. Those two forces are called the \inertial force.\ground, called the \posture has to work to make it happen. This is called the \zero moment point\(ZMP). To control ASIMO's posture, engineers worked on three areas of control:? ?Floor reaction control means that the soles of the feet absorb floor unevenness while still maintaining a firm stance.Target ZMP control means that when ASIMO can't stand firmly and its body begins to fall forward, it maintains position by moving its upper body in the direction opposite the impending fall. At the same time, it speeds up its walking to quickly counterbalance the fall.?Foot-planting location control kicks in when the target ZMP control has been activated. It adjusts the length of the step to regain the right relationship between the position and speed of the body and the length of the step.ASIMO's Motion: Smooth MovesASIMO can sense falling movements and react to them quickly; but ASIMO's engineers wanted more. They wanted the robot to have a smooth gait as well as do something that other robots can't do -- turn without stopping.When we walk around corners, we shift our center of gravity into the turn. ASIMO uses a technology called \predictive movement control,\Intelligent Real-Time Flexible Walking Technology or I-Walk, to accomplish that same thing. ASIMO predicts how much it should shift its center of gravity to the inside of the turn and how long that shift should be maintained. Because this technolgy works in real time, ASIMO can do this without stopping between steps, which other robots must do.Essentially, with every step ASIMO takes, it has to determine its inertia and then predict how its weight needs to be shifted for the next step in order to walk and turn smoothly. It adjusts any of the following factors in order to maintain the right position:? ? ? ?the length of its steps its body position its speedthe direction in which it is steppingWhile reproducing a human-like walk is an amazing achievement, ASIMO can now run at speeds up to 3.7 miles per hour (6 kilometers per hour). In order to qualify as a true running robot, ASIMO must have both feet off the ground for an instant in each step. ASIMO manages to be airborne for .08 seconds with each step while running. Honda engineers encountered an entirely new set of challenges while trying to give ASIMO the ability to run. They gave ASIMO’s torso a degree of freedom to aid in bending and twisting so that the robot could adjust its posture while airborne. Without this ability, ASIMOwould lose control while airborne, possibly spinning in the air or tripping when landing.In order to make turns smoothly while running, the engineers enhanced ASIMO's ability to tilt its center of gravity inside turns to maintain balance and counteractcentrifugal force. ASIMO could even anticipate turns and begin to lean into them before starting the turn, much like you would if you were skiing or skating.ASIMO如何工作介绍如何工作。

科技英语中英文对照翻译

mobile and cellular radio移动和细胞广播in comparison to the relative stability and modest technical developments which are occurring in long haul wideband microwave communication systems there is rapid development and expanding deployment of new mobile personal communication system. These rang from wide coverage area pagers,for simple data message transmission,which employ common standards and hence achieve contiguous coverage over large geographical areas,such as all the major urban centres and transport routes in Europe,Asia or the continental USA.This chapter discusses the special channel characteristics of mobile systems and examines the typical cellular clusters adopted to achieve continuous communication with the mobile user.It then highlights the important properties of current,and emerging,TDMA and code division multiple access(CDMA), mobile digital cellular communication systems.Private mobile radioTerrestrial mobile radio works best at around 250 MHz as lower frequencies than this suffer from noise and interference while higher frequencies experience multipath propagation from buildings,etc,section 15.2.In practice modest frequency bands are allocated between 60MHz and 2GHz. Private mobile radio(PMR) is the system which is used by taxi companies,county councils,health authorities,ambulance services,fire services,the utility industries,etc,for mobile communications.PMR has three spectral at VHF,one just below the 88 to 108 MHz FM broadcast band and one just above this band with another allocation at approximately 170MHz.There are also two allocations at UHF around 450MHz. all these spectral allocations provide a total of just over 1000 radio channels with the channels placed at 12KHz channel spacings or centre frequency offsets. Within the 12khz wide channal the analogue modulation in PMR typically allows 7khz of bandwidth for the signal transmission.when further allowance is made for the frequency drift in the oscillators of these systems a peak deviation of only 2 to 3 khz is available for the speech traffic. Traffic is normally impressed on these systems by amplitude modulation or frequency modulation and again the receiver is of the ubiquitous superheterodyne design,Figure 1.4. A double conversion receiver with two separate local oscillator stages is usually required to achieve the required gain and rejection of adjacent channel signals.One of the problems with PMR receiver is that they are requiredto detect very small signals,typically—120dBm at the antenna output,corresponding to 0.2 uV,and,after demodulating this signal,produce ann output with perhaps 1W of audio equipment, the first IF is normally at10.7MHz and the second IF is very orten at 455KHz . unfortunately,with just over 1000 available channels for the whole of the UK and between 20000and30000issued licences for these systems,it is inevitable that the average busuness user will have to share the allocated channel with other companies in their same geographical area.There are various modes of operation for mobile radio communications networks, the simplest of which is singal frequency simplex. In simplex communication, traffic is broadcast, or one way. PMR uses half duplex(see later Table 15.3) where, at the end of each transmission period, there is a handover of the single channel to the user previously receiving, in order to permit them to reply over the same channel. This is efficient in that it requires only one frequency allocation for the communication link but it has the disadvantage that all units canhear all transmissions provided they are within rage of the mobile and frequencies are allocated for the transmissions. One frequency is used for the forward or downlink, namely base-to-mobile communications. This permits simultaneous two-way communication and greatly reduces the level of interference, but it halves other’s transmissions, which can lead to contention with two mobiles attempting to initiate a call, at the same time, on the uplink in a busy syetem.Although PMR employs relatively simple techniques with analogue speech transmission there have been many enhancements to these systems over the years . Data transmission is now in widespread use in PMR systems using FSK modulation. Data transmission also allows the possibility of hard copy graphics output and it gives direct access to computer services such as databases, etc. Data prembles can also be used, in a selective calling mode, when initiating a transmission to address a special receiver and thus obtain more privacy within the system.15.4.5 Trunked radio for paramilitary use集群无线电的军事使用Another related TDMA mobile radio standard is the European trunked radio(TETRA)network which has been developed as part of the public safety radio communications service(PSRCS) for use by police, utilities, customs office, etc. TETRA in fact is part of wider international collaborations for paramilitary radio use.In these portable radios there is a need for frequency hopping (FH) to give an antieavesdropping capability and encryption for security of transmission to extend military mobile radio capabilities to paramilitary use, i.e. for police, customs and excise offices, etc. these capabilities are included in the multiband interteam radio for the associated public safety communications office in the USA while Europe has adopted the TETRA standard.TETRA is essentially the digital TDMA replacement of the analogue PMR systems. The TETRA standard has spectrum allocations of 380 to 400 and 410 to 430MHz, with the lower band used for mobile transmissions and the upper band for base station use. TETRA mobile have 1 W output power and the base stations 25 W using error with the data throughput rate varying, to meet the required quality of service. TETRA can accommodate up to four users each with a basic speech or data rate of 7.2kbit/s. with coding and signaling overheads, the final transmission rate for the four-user slot is 36 kbit/s. this equipment is large and more sophisticated than a commercial cell phone, and it sells for a very much higher price becase the production runs are much small. However, its advanced capabilities are essential for achieving paramilitary communications which are secure from eavesdropping.15.5 Code division multiple accessAnalogue communication systems predominantly adopt frequency division multiple access (FDMA), where each subscriber is allocated a narrow frequency slot within the available channel. The alternative TDMA(GSM) technique allocates the entire channel bandwidth to a subscriber but constrains the subscriber but constrains the subscriber to transmit only regular short bursts of wideband signal. Both these accessing techniques are well established for long haulterrestrial, satellite and mobile communications as they offer very good utilization of the available bandwidth.15.5.1The inflexibility of these coordinated accessing techniques has resulted in the development of new systems based on the uncoordinated spread spectrum concept. In these systems the bits of slow speed data traffic from each subscriber are deliberately multiplied by a high chip rate spreading code, forcing the low rate (narrowband data signal) to fill a wide channel bandwidth.15.7.2 3G systemsThe evolution of the third generation (3G)system began when the ITU produce the initial recommendations for a new universal mobile telecommunications system(UMTS)[www.] The 3G mobile radio service provides higher data rate services ,with a maximum data rate in excess of 2Mbit/s, but the achievable bit rate is linked to mobility. Multimedia applications encompass services such as voice, audio/video, graphics, data, Internet access and e-mail. These packet and circuit switched services have to be supported by the radio interface and the network subsystem.Several radio transmission technologies(RTT) were evaluated by the ITU and adopted into the new standard, IMT-2000. the European standardization body for 3G, the ETSI Special Mobile Group, agreed on a radio access scheme for 3G UMTS universal terrestrial radio access(UTRA) as an evolution of GSM. UTRA consists of two modes : frequency division duplex(FDD) where the uplink and downlink are transmitted on different frequencies; and time division duplex(TDD) where the uplink and downlink are time multiplexed onto the same carrier frequency. The agreement assigned the unpaired bands (i.e. for UTRA TDD ). TD-CDMA is a pure CDMA based system. Both modes of UTRA have been harmonised with respect to basic system parameters such as carrier spacing, chip rate and frame length to ensure the interworking of UTRA with GSM.The 3G proposal were predominantly based wideband CDMA(WCDMA) and a mix of FDD and TDD access techniques. WCDMA is favoured for 3G in poor propagation environments with a mix of high modest speed data traffic. It is generally accepted that CDMA is the preferred accesstechnique and, with the increase in the data rate, then the spreading modulation needs to increase to wideband transmission.WCDMA is based on 3.84Mchip/s spreading codes with spreading ratio, i.e. , K values, of 4-256 giving corresponging data ratas of 960-15 kbit/s. the upper FDD uplink band I from 1920-1980 MHz is paired with a 2110-2170 MHz downlink. In addition uplink bands II & III at 1850-1910 MHz and 1710-1785 MHz are also paired, respectively, with 1930-1990 MHz and 1805-1880 MHz allocations. the system is configured on a 10 ms frame with 15 individual slots to facilitate TDD as well as FDD transmissions. TDD is more flexible as time-slots can be dynamically reassigned to uplink and downlink functions, as required for asymmetric transfer of large files or video on demand traffic. 3G WCDMA systems use an adaptive multirate speech coder with encoded rates of 4.75-12.2 kbit/s. receivers commonly use the easily integrated direct conversion design, in place of the superheterodyne design . receiver sensitivities are typically -155dBm.The 3GPP2 standard aims to achieve a wide area mobile wireless packet switched capability with CDMA2000 1×EV DO revision A (sometimes called IS-856A). Here 1×refers to the single carrier 1.25 Mchip/s system. It achieves a 3.1 Mbit/s downlink and a delay sensitive services. The 3GPP standard has gone through many release with R4 in 2001 which introduced packet data services and R6 in 2005 to further increase the available data transmission rate . R6 pioneers the use of high-speed downlink packet access and multimedia broadcast multicast services which offer reduced delays and increased uplink data rates approaching 6 Mbit/s.In parallel with the European activities extensive work on 3G mobile radio was also performed in Japan. The Japanese standardisation body also chose WCDMA, so that the Japanese and European proposals for the FDD mode were already aligned closely. Very similar concepts have also been adopted by the North American standardization body.In order to work towards a global 3G mobile radio standard, the third generation partnership project(3GPP), consisting of members of the standardization bodies in Europe, the USA, Japan, Korea and China, was formed. It has merged the already well harmonized proposals of the regional standardization bodies to work on a common 3G international mobile radio standard, still called UTRA. The 3GPP Project 2(3GPP2), on the other hand, works towards a 3G mobile radio standard based on cdmaOne/IS-95 evolution, originally called CDMA2000.比起相对稳定、适度的技术发展是发生在宽带微波通信系统,有长期快速发展和扩大部署的新的移动个人通讯系统。

科技翻译教程

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1 科技英语文体的特征、功能和语境
1.3 普通科技文体 1.3.1 普通科技文体用词平易 1.3.1.3 多用代词
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1 科技英语文体的特征、功能和语境
1.3 普通科技文体 1.3.2 普通科技文体句法简单 1.3.2.1 使用短句
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1 科技英语文体的特征、功能和语境
taxi 在航空中指飞机在水（地）面滑行
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1 科技英语文体的特征、功能和语境
1.2.2 专用科技文体用词正式
brain
encephalon
.2.2 专用科技文体用词正式
(石油)钻头 bit
（机械加工）军刀，切削刀（数学）二进制数
试样可夹在具有同样硬度的工件之间，可镀层。
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1 科技英语文体的特征、功能和语境
1.2.1 专用科技文体语义特征 1.2.1.2 非人称化 1) 少用代词，偶见人称代词we
2) 多用被动（近二三十年多用主动）
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1 科技英语文体的特征、功能和语境
1.2.1 专用科技文体语义特征 1.2.1.3 名词化（Nominalization）
seismic regions
earthquake belts
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1 科技英语文体的特征、功能和语境
1.3 普通科技文体 1.3.1 普通科技文体用词平易
1.3.1.2 用动词代替抽象名词 We ask for the cooperation of all employee.
We ask that all employees cooperate.