机械工程英语(叶邦彦)_第二部分翻译(全)
机械工程英语第二版（叶邦彦陈统坚著）机械工程出版社课文翻译
Unit 1 材料的种类（1）材料的分类方法很多。
科学家常用的典型的方法是根据它们的状态分类：固体，液态或气态。
材料也分为有机（可再生）和无机材料（不可再生）。
（2）工业上，材料划分为工程材料或非工程材料。
工程材料用于制造和加工成零件的材料。
非工程材料是化学药品，燃料，润滑剂和其它用于制造又不用来加工成零件的材料。
（3）工程材料可进一步细分为：金属，陶瓷，复合材料，聚合材料，等。
Metals and Metal Alloys 金属和金属合金金属和金属合（4）金属有好的导电好导热性，很多金属有高的强度，高硬度和高的延展性。
象铁，钴，镍这些金属有磁性。
在非常低的温度下，一些金属和金属互化物变成超导体。
（5）合金和纯金属有什么区别？纯金属在元素周期表的特殊区域。
例如用于制造电线的铜和做锅和饮料罐的铝。
合金含有两种以上的金属元素。
改变金属元素的比例可以改变合金的性质。
例如，合金金属的不锈钢，是由铁，镍，和铬组成。
而黄金珠宝含有金镍合金。
（6）为什么要使用金属和合金？很多金属和合金有很高密度并用在要求质量与体积比高的的场合。
一些金属合金，象铝基合金，密度低，用在航空领域可以节省燃料。
很多合金有断裂韧度，可以承受冲击，且耐用。
金属有哪些重要属性？（7）【密度】质量除以体积叫做密度。
很多金属有相对高的密度,特别的，象聚合体。
高密度的材料常是原子量很大，象金或铅。
然而一些金属，像铝或镁密度低，就常常用在要求有金属特性而又要求低质量的场合。
（8）【断裂韧性】断裂韧度用来描述金属抗断裂的能力，特别的，当有裂纹时。
金属通常都有无关紧要的刻痕和凹坑，且有耐冲击性。
足球队员关注这一点当他确信面罩不会被击碎的时候。
（9）【塑形变形】塑性变形表述的是材料在断裂之前弯曲变形的能力。
作为工程师，我们通常设计材料使得能够在正常情况下不变形。
你不会想要一阵强烈的西风就把你的车刮得往东倾斜。
然而，有时，我们可以利用塑性变形。
汽车的承受极限就是在彻底破坏之前靠塑形变形来吸收能量。
机械工程英语第二版part2unit8翻译加词组
Unit 8 Flexible Manufacturing Systems What Is FMS?FMS是什么?Definitions of FMS, or Flexible Manufacturing Systems, are plentiful and in many respects are dependent on the ultimate user's point of view as to what the FMS consists of and how it will be used. However, the following represent a collection of FMS definitions, some traceable and some not traceable to their originating source.关于柔性制造系统，有很多不同的定义，多数情况下，如何对其定义依赖于其使用者对其组成部分和使用方法的个人看法。
然而，接下来的描述是对FMS 定义的概括，那就是有缘可循和无源可寻的资源。
1) United States Government. A series of automatic machine tools or items of fabrication equipment linked together with an automatic material handling system, a common hierarchical digital pre-programmed computer control, and provision for random fabrication of parts or assemblies that fall within predetermined families.美国政府，一系列自动机床或自动材料处理系统，一个共同的分层预先设定的数字电脑控制，并随机制造的零件或装配，在预定的家庭内的条文，一并与设备制造项目。
机械工程英语(叶邦彦)_第二部分翻译(全)
机械工程英语(叶邦彦)_第二部分翻译(全)Unit 1 计算机技术Introduction前言The central and essential ingredient of GAD/CAMis the digital computer.〔1〕Its inherent speed and storage capacity have made it possible to achieve the advances in image processing, real-time process control, and a multitude of other important functions that are simply too complex and time-consuming to perform manually. To understand CAD/CAM itis important to be familiar with the concepts and technology of the digital computer CAD/CAM的重要组成部分是数字计算机，它固有的速度以及存储能力似的它能够在图像处理，实时过程控制以及很多因太复杂太费时而人工无法完成的其他重要功能方面获得进步，要想懂得CAD/CAM，熟悉数字电脑的概念和技术是很重要的.The modern digital computer is an electronic machine that can perform mathematical and logical calculations and data processing functions in accordance with a predetermined program of instructions. The computer itselfis referred to as hardware, whereas the various programs are referred to as software.现在数字计算机是一部能够根据预定的程序来完成数字和逻辑运算以及数据处理功能的电子设备，计算机本身称为硬件，而各种各样的程序称为软件 There are three basic hardware components of a general-purpose digital computer; 一般用途的数字计算机由三种基本硬件组成 .Central processing unit (CPU) 微处理器 .Memory存储器.Input/output ( I/0 )section输入/输出设备The relationship of these three components is illustrated in Fig. 1.1. The central processing unit is often considered to consist of two subsections; a control unit and an arithmetic-logic unit (ALU). 这三个组成部分的关系如图1.1所示，中央处理器通常被认为包含两部分:一个控制器和一个运算器.The control unit coordinates the operations of all the other components. 控制器控制所有其他组成部分的运输。
机械工程英语第二版叶邦彦_汉语翻译(机械工业出版社)--全本书翻译
•Types of Materials 材料的类型Materials may be grouped in several ways. Scientists often classify materials by their state: solid, liquid, or gas. They also separate them into organic (once living) and inorganic (never living) materials.材料可以按多种方法分类。
科学家常根据状态将材料分为：固体、液体或气体。
他们也把材料分为有机材料(曾经有生命的)和无机材料(从未有生命的)。
For industrial purposes, materials are divided into engineering materials or nonengineering materials. Engineering materials are those used in manufacture and become parts of products.就工业效用而言，材料被分为工程材料和非工程材料。
那些用于加工制造并成为产品组成部分的就是工程材料。
Nonengineering materials are the chemicals, fuels, lubricants, and other materials used in the manufacturing process, which do not become part of the product.非工程材料则是化学品、燃料、润滑剂以及其它用于加工制造过程但不成为产品组成部分的材料。
Engineering materials may be further subdivided into: ①Metal ②Ceramics ③Composite ④Polymers, etc.工程材料还能进一步细分为：①金属材料②陶瓷材料③复合材料④聚合材料，等等。
机械英语2
机械工程英语第二版叶邦彦陈统坚主编Casting is a manufacturing process in which molten metal is poured or injected and allowed to solidify in a suitably shaped mold cavity. During or after cooling, the cast part is removed from the mold and then processed for delivery.铸造是一种将熔化的金属倒入或注入合适的铸模腔并且在其中固化的制造工艺。
在冷却期间或冷却后，把铸件从铸模中取出，然后进行交付。
Casting processes and cast-material technologies vary from simple to highly complex. Material and process selection depends on the part’s complexity and function, the product’s quality specifications, and the projected cost level.铸造工艺和铸造材料技术从简单到高度复杂变化很大。
材料和工艺的选择取决于零件的复杂性和功能、产品的质量要求以及成本预算水平。
Castings are parts that are made close to their final dimensions by a casting process. With a history dating back 6,000 years, the various casting processes are in a state of continuous refinement and evolution as technological advances are being made.通过铸造加工，铸件可以做成很接近它们的最终尺寸。
机械工程英语第二版全本书中英对照翻译
•Types of Materials材料的类型Materials may be grouped in several ways. Scientists often classify materials by their state: solid, liquid, or gas. They also separate them into organic (once living) and inorganic (never living) materials.材料可以按多种方法分类。
科学家常根据状态将材料分为：固体、液体或气体。
他们也把材料分为有机材料(曾经有生命的)和无机材料(从未有生命的)。
For industrial purposes, materials are divided into engineering materials or nonengineering materials. Engineering materials are those used in manufacture and become parts of products.就工业效用而言，材料被分为工程材料和非工程材料。
那些用于加工制造并成为产品组成部分的就是工程材料。
Nonengineering materials are the chemicals, fuels, lubricants, and other materials used in the manufacturing process, which do not become part of the product.非工程材料则是化学品、燃料、润滑剂以及其它用于加工制造过程但不成为产品组成部分的材料。
Engineering materials may be further subdivided into: ①Metal ②Ceramics ③Composite ④Polymers, etc.工程材料还能进一步细分为：①金属材料②陶瓷材料③复合材料④聚合材料，等等。
机械工程英语_第二部分翻译
Unit5 INDUSTRIAL ROBOT工业机器人INTRODUCTION介绍Industrial robots are relatively new electromechanical devices that are beginning to change the appearance of modern industry. Industrial robots are not like the science fiction devices that possesshuman-like abilities and provide companionship with space traveler、Research to enable robots to “see，"hear"，“touch"，and "listen" has been underway for two decades and is beginning to bearfruit. However，the current technology of industrial robots is such that most robots contain Onlyan arm rather than all the anatomy a human possesses. Current control only allows these devicesto move from point to point in space，performing relatively simple taskes. The Robotics Instituteof America defines a robot as“a reprogramrnab le multifunction manipulator designed to movematerial，parts, tools，or other specialized devices through variable programmed motions for the performance of a variety of tasks. "' A NC machining center would qualify as a robot if one wereto interpret different types of machining as different functions- Most manufacturing engineers donot consider a NC machining center a robot，even though these machines hive a number of situ-ilarities. The power drive and controllers of both NC machines and robots can be quite similar.Robots, like NC machines can he powered by electrical motors，hydraulic systems，or pnetinlat tc svsterns. Control for either device can lye either open-loop or closed-loop. In fact，many of the developments used in robotics have evolved from the NC industry，and many of the manufactur-ers of robots also manufacture NC machines or NC controllers.工业机器人是相对来说较新的机电设备，它已经开始改变现代工业的面貌。
机械工程英语第二版part2unit8翻译加词组
Unit 8 Flexible Manufacturing Systems What Is FMS?FMS是什么?Definitions of FMS, or Flexible Manufacturing Systems, are plentiful and in many respects are dependent on the ultimate user's point of view as to what the FMS consists of and how it will be used. However, the following represent a collection of FMS definitions, some traceable and some not traceable to their originating source.关于柔性制造系统，有很多不同的定义，多数情况下，如何对其定义依赖于其使用者对其组成部分和使用方法的个人看法。
然而，接下来的描述是对FMS 定义的概括，那就是有缘可循和无源可寻的资源。
1) United States Government. A series of automatic machine tools or items of fabrication equipment linked together with an automatic material handling system, a common hierarchical digital pre-programmed computer control, and provision for random fabrication of parts or assemblies that fall within predetermined families.美国政府，一系列自动机床或自动材料处理系统，一个共同的分层预先设定的数字电脑控制，并随机制造的零件或装配，在预定的家庭内的条文，一并与设备制造项目。
机械工程英语第二版(机械工业出版社,叶邦彦、陈统坚)--全本书(两部分)翻译
•Types of Materials材料的类型Materials may be grouped in several ways. Scientists often classify materials by their state: solid, liquid, or gas. They also separate them into organic (once living) and inorganic (never living) materials.材料可以按多种方法分类。
科学家常根据状态将材料分为：固体、液体或气体。
他们也把材料分为有机材料(曾经有生命的)和无机材料(从未有生命的)。
For industrial purposes, materials are divided into engineering materials or nonengineering materials. Engineering materials are those used in manufacture and become parts of products.就工业效用而言，材料被分为工程材料和非工程材料。
那些用于加工制造并成为产品组成部分的就是工程材料。
Nonengineering materials are the chemicals, fuels, lubricants, and other materials used in the manufacturing process, which do not become part of the product.非工程材料则是化学品、燃料、润滑剂以及其它用于加工制造过程但不成为产品组成部分的材料。
Engineering materials may be further subdivided into: ①Metal ②Ceramics ③Composite ④Polymers, etc.工程材料还能进一步细分为：①金属材料②陶瓷材料③复合材料④聚合材料，等等。
机械工程英语叶邦彦第二单元到第四单元课文 翻译综述
Unit 2 Numerical Control of Production EquipmentUnit 2 生产设备的数字控制Numerical Control (NC) is a form of programmable automation in which the processing equipment is controlled by means of numbers, letters, and other symbols. The numbers, letters, and symbols are coded in an appropriate format to define a program of instructions for a particular work-part or job. 数控是程序控制的自动化，在数字控制系统中，设备通过数字，字母和符号来编码，以一种合适的格式为每一个特定的零件或工件定义一个程序指令集。
When the job changes, the program of instructions is changed. The capability to change the program is what makes NC suitable for low-and medium-volume production. It is much easier to write new programs than to make major alterations of the processing equipment.当工件变化时，程序也变化，改变程序的能力亦适合中小批量生产。
写一个新程序比改变大量生产设备要容易的多。
Basic Components of NC数控基本结构A numerical control system consists of the following three basic components:数控系统由下面三部分组成：• Program of instructions控制程序• Machine control unit机器控制单元• Processing equipment加工设备The general relationship among the three components is illustrated in Fig. 2.1. The program is fed into the control unit, which directs the processing equipment accordingly.三部分的基本关系，由图 2.1 所示。
机械工程英语第二版PART2 Unit 9中英文对照
Unit 9 Computer-Integrated Manufacturing System COMPUTER INTEGRATED MANUFACTURING SYSTEM (1)计算机集成技术CIM DEFINEDComputer-integrated manufacturing or (CIM) is the term used to describe the most modern ap-proach to manufacturing. Although CIM encompasses many of the other advanced manufacturingtechnologies such as computer numerical control (CNC) ,computer-aided design/computer-aidedmanufacturing (CAD/CAM)。
robotics，and just一in-time delivery (J1T)，it is more than a newtechnology or a new concept. Computer-integrated manufacturing is actually an entirely new ap-proach to manufacturing a new way of doing business.计算机集成制造(或CIM)是用来描述最现代化的一种制造方法的词汇。
尽管CIM包含了许多其他的先进制造技术,如计算机数字控制(CNC),计算机辅助设计/计算机辅助制造(CAD / CAM),机器人学和及时供货等,但它不仅仅是一种更高层次新技术或新概念。
计算机集成制造实际上是一种全新的制造方法和一种全新的贸易方式。
To understand CIM，it is necessary to begin with a comparison of modern and traditionalmanufacturing. Modern manufacturing encompasses ail of the activities andprocesses necessary to convert raw materials into finished products, deliver them to the market,and support them in thefield'. These activities include the following为了理解CIM，有必要一开始就有一个现代和传统制造业的比较。
机械工程英语叶邦彦第二单元到第四单元课文+翻译
Unit 2 Numerical Control of Production EquipmentUnit 2 生产设备的数字控制Numerical Control (NC) is a form of programmable automation in which the processing equipment is controlled by means of numbers, letters, and other symbols. The numbers, letters, and symbols are coded in an appropriate format to define a program of instructions for a particular work-part or job. 数控是程序控制的自动化，在数字控制系统中，设备通过数字，字母和符号来编码，以一种合适的格式为每一个特定的零件或工件定义一个程序指令集。
When the job changes, the program of instructions is changed. The capability to change the program is what makes NC suitable for low-and medium-volume production. It is much easier to write new programs than to make major alterations of the processing equipment.当工件变化时，程序也变化，改变程序的能力亦适合中小批量生产。
写一个新程序比改变大量生产设备要容易的多。
Basic Components of NC数控基本结构A numerical control system consists of the following three basic components:数控系统由下面三部分组成：• Program of instructions控制程序• Machine control unit机器控制单元• Processing equipment加工设备The general relationship among the three components is illustrated in Fig. 2.1. The program is fed into the control unit, which directs the processing equipment accordingly.三部分的基本关系，由图 2.1 所示。
机械工程英语第二版(叶邦彦 陈统坚主编)第二部分书后翻译
Unit 1 计算机技术1、The central and essential ingredient of GAD/CAM is the digital computer. CAD/CAM的核心部分是数字计算机。
2、Sinfnal conditioners,which filter random electrical noise and smooth the signal emanating from transducting devices.信号调整器，它可以过滤掉杂乱的电噪声，并可修整、平滑由传感装置送出的模拟信号。
3、A pulse counter is used to convert the pulse trains into a digital representation ,which is then aplied to the computer”s input channel. 脉冲计数器可将脉冲串转换为一种数字代码，以适合于计算机输入通道。
4、This results from the shared nature of the communication lines.这来自通信线的共享特性。
5、messages to a specific computer are usually transmitted to all computers in the network,with the addressee decoding its address and accdot the information.送往某特定计算机的信息，一般都传送到网络中的所有计算机，同时由信息接收计算机译出地址码并接收信息。
6、In a network,all computers are connected and communicated with each other according to some kinds of enacthed regulations or agreement,which are called"network protocols".在网络中，所有计算机都根据一些规则和协议进行连接和通信，规则和协议称为网络协议。
机械工程英语第2版叶邦彦Unit2
机械工程英语第2版叶邦彦Unit2Unit 2 Heat Treatment of Metals What is heat treatment ？Iron-Carbon Diagram AnalysisHeat Treatment TechniquesWhat is heat treatment ？The understanding of heat treatment is embraced by the broader study of metallurgy. Metallurgy is the physics, chemistry, and engineering related to metals from ore extraction to the final product.Heat treatment is the operation of heating and cooling a metal in its solid state to change its physical properties. According to the procedure used, steel can be hardened to resist cutting action and abrasion, or it can be softened to permit machining.Heat Treatment ApplicationMay remove internal stressesMay reduce grain sizeMay increase toughnessMay produce a hard surface on a ductile interiorThe analysis of the steel must be known because small percentages of certain elements, notably carbon, greatly affect the physical properties.Alloy steels owe their properties to the presence of one or more elements other than carbon, namely nickel, chromium , manganese, molybdenum , tungsten, silicon, vanadium , and copper.[1] Because of their improved physical properties they are used commercially in many ways not possible with carbon steels.Iron-Carbon Diagram AnalysisThose portions of the iron-carbon diagram near thedelta region and those above 2% carbon content are of little importance to the engineer and are deleted.[2] A simplified diagram, such as Fig.2.1, focuses on theeutectoid region and is quite useful in understanding the properties and processing of steel.The key transition described in this diagram is the decomposition of single-phase austenite (Y) to the two-phase ferrite plus carbide structure as temperature drops.Control of this reaction, which arises due to the drastically different carbon solubility of austenite and ferrite, enables a wide range of properties to be achieved through heat treatment .The transition processAt the upper temperatures, only austenite is present, the 0.77% carbon being dissolved in solid solution with the iron. When the steel cools to 727℃(1341℉), several changes occur simultaneously . The iron wants to change from the fcc austenite structure to the bcc ferrite structure, but the ferrite can only contain 0.02% carbon in solid solution. [3]The rejected carbonforms the carbon-richcementite intermetallicwith composition Fe3C.In essence, the netreaction at the eutectoidaustenite ：0.77%Cferrite：0.02%Ccementite：6.67%CFig.2.1 Simplified ion-carbon diagramSince this chemical separation of the carbon component occurs entirely in the solid state, the resulting structure is a fine mechanical mixture of ferrite and cementite. Specimens prepared by polishing and etching in a weak solution of nitric acid and alcohol reveal the lamellar structure of alternating plates that forms on slow cooling.Heat Treatment Techniques HardeningTemperingAnnealingNormalizingSpheroidizingSurface HardeningHardeningDefinition：Hardening is the process of heating a piece of steel to a temperature within or above its critical range and then cooling it rapidly.Influencing factors:1.the correct temperature is obtained.2.the rate of heating is important.3.The hardness obtained from a given treatment dependson the quenching rate, the carbon content, and work size.TemperingSteel that has been hardened by rapid quenching is brittle and not suitable for most uses. By tempering or drawing, the hardness and brittleness may be reduced to the desired point forservice conditions. As these properties are reduced there is also a decrease in tensile strength and an increase in the ductility and toughness of the steel.The operation consists of reheating quench-hardened steel to some temperature below the critical range followed by any rate of cooling. The final structure obtained from tempering fully hardened steel is called tempered martensite.Tempering is possible because of the instability of the martensite, the principal constituent of hardened steel. Low-temperature draws from 300℉to 400℉(150℃~205℃), do not cause much decrease in hardness and are used principally to relieve internal strains.AnnealingThe primary purpose of annealing is to soften hard steelso that it may be machined or cold worked. This is usually accomplished by heating the steel too slightly above the critical temperature, holding it there until the temperatureof the piece is uniform throughout, and then cooling at a slowly controlled rate so that the temperature of the surface and that of the center of the piece are approximately the same.Annealing effectswipes out all trace of previous structure；refines the crystalline structure；softens the metal；relieves internal stresses previously set up in the metal.The temperature to which given steel should be heated in annealing depends on its composition; for carbon steels it can beobtained readily from the partial iron-iron carbide equilibrium diagram. The heating rate should be consistent with the size and uniformity of sections, so that the entire part is brought up to temperature as uniformly as possible.NormalizingThe process of normalizing consists of heating the steel about 50℉to 100℉(10℃～40℃) above the upper critical range and cooling in still air to room temperature. This process is principally used with low-and medium-carbon steels as well as alloy steels to make the grain structure more uniform, to relieve internal stresses, or to achieve desired results in physical properties.SpheroidizingSpheroidizing is the process of producing astructure in which the cementite is in a spheroidal distribution. If steel is heated slowly to a temperature just below the critical range and held there for a prolonged period of time, this structure will be obtained.Methods Of Surface HardeningCarburizingCarbonitridingCyaniding [氰化]Nitriding [渗氮]CarburizingThe oldest known method of producing a hard surface on steel is case hardening or carburizing. Iron at temperatures close to and above its critical temperature has an affinity for carbon.Thecarbon is absorbed into the metal to form a solid solution with iron and converts the outer surface into high-carbon steel.Pack carburizing consists of placing the parts to be treated in a closed container with some carbonaceous material such as charcoal or coke.。
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
机械工程英语(叶邦彦)_第二部分翻译(全)Unit 1 计算机技术Introduction前言The central and essential ingredient of GAD/CAMis the digital computer.〔1〕Its inherent speed and storage capacity have made it possible to achieve the advances in image processing, real-time process control, and a multitude of other important functions that are simply too complex and time-consuming to perform manually. To understand CAD/CAM itis important to be familiar with the concepts and technology of the digital computer CAD/CAM的重要组成部分是数字计算机，它固有的速度以及存储能力似的它能够在图像处理，实时过程控制以及很多因太复杂太费时而人工无法完成的其他重要功能方面获得进步，要想懂得CAD/CAM，熟悉数字电脑的概念和技术是很重要的.The modern digital computer is an electronic machine that can perform mathematical and logical calculations and data processing functions in accordance with a predetermined program of instructions. The computer itselfis referred to as hardware, whereas the various programs are referred to as software.现在数字计算机是一部能够根据预定的程序来完成数字和逻辑运算以及数据处理功能的电子设备，计算机本身称为硬件，而各种各样的程序称为软件 There are three basic hardware components of a general-purpose digital computer; 一般用途的数字计算机由三种基本硬件组成 .Central processing unit (CPU) 微处理器 .Memory存储器.Input/output ( I/0 )section输入/输出设备The relationship of these three components is illustrated in Fig. 1.1. The central processing unit is often considered to consist of two subsections; a control unit and an arithmetic-logic unit (ALU). 这三个组成部分的关系如图1.1所示，中央处理器通常被认为包含两部分:一个控制器和一个运算器.The control unit coordinates the operations of all the other components. 控制器控制所有其他组成部分的运输。
It controls the input and output of information between the computer and the outside world through the I/O section, synchronizes the transference of signals between the various sections of the computer, and commands the other sections in the performance of their functions.它通过输入/输出端口控制电脑与外围设备之间信息的输入与输出、控制电脑各部分间信号的传输，同时也控制其他部分完成各自的功能。
The arithmetic-logic unit carries out the arithmetic and logic manipulations of data. 运算器完成数据的算术和逻辑运算。
It adds, subtracts, multiplies, divides, and compares numbers according to programmed instructions. The memory of the computer is the storage unit. 它根据编制的程序完成数的加、减、乘、除和比较。
存储器完成电脑的记忆功能。
The data stored inthis section are arranged in the form of words which can be conveniently transferred to the ALU or I/0 section for processing.数据被转译成便于向运算器和输入/输出设备传输以进行处理的字节形式存储在该部分中Finally, the input/output provides the means for the computer to communicate with the external world. This communication is accomplished through peripheral equipment such as readers, printers, and process interface devices. 最后，输入/输出设备提供电脑和外部世界的交流手段，这种交流通过像阅读机、打印机和出口设备等外围设备完成。
The computer may also be connected to external storage units (e. g，tapes, disks, etc) through the UO section of the computer电脑也可以通过输入/输出设备与外围存储设备（比如磁带、磁盘）链接。
.The software consists of the programs and instructions stored in memory and in external storage units. It is the software that assigns the various functions which the user desires the system to accomplish to the computer. 软件由程序和存储在内存与外存中的指令组成。
软件将使用者所要求系统完成的各项功能分配给计算机。
The usefulness of the computer lies in its ability to execute the instructions quickly and accurately. 电脑的有用性在于它快速准确地执行程序的能力。
Because the contents of the computer' s memory can be easily changed, and therefore different programs can be placed into memory, the digital computer can be used for a wide variety of applications.因为电脑存储的内容你能够很容易被改变，并且不同的程序都能够被存入，所以数字电脑能够用于多种应用。
Regardless of the application, the computer executes the program throughits ability to manipulate data and numbers in their most elementary form. 不考虑这些应用，电脑能自动执行程序并以最基本的形式完成数字和数据的运算。
The data and numbers are represented in the computer by electrical signals which can take one of two alternative states.数据和数字在电脑中以两种形式的电信号的一种表示。
This form of representation is called the binary system. 这种表示形式叫1做二进制计数法。
The more familiar decimal number system and a whole hostof soft-ware languages can utilize the binary system to permit communication between computers and human beings.更多与之类似的十进制计数法以及很多软件语言利用二进制计数法在电脑和人之间实现交流。
Central Processing Unit (CPU) 中央处理器The central processing unit (CPU) regulates the operation of all system components and performs the arithmetic and logical operations on the data. 中央处理器控制所有系统组成的操作并进行数据的算术和逻辑运算。
To accomplish these functions, the CPU consists of two operating units:为了完成这些功能，中央处理器包含两个结构单元：.Control unit ・Arithmetic-logic unit (ALU) 控制器、运算器The control unit coordinates the various operations specified by the program instructions. 控制器控制由程序制定的各种操作。