计算机专业英语 第六版 Project seven The online shopping

In this part, our target is to train the speed of reading professional article and comprehension. We have made the flexible sentences strong black and marked the subject, predicate and object of them . Try to grasp the main idea of these sentences.
• 主语、谓语、宾语
Project Seven The online shopping
mall’s security
Part A Theoretical study sectionFra bibliotek— 3—
Skill One Computer’s Virus
What is a computer virus? A computer virus is a special kind of computer program that reproduces its own code by attaching itself to other executable files, and spreads usually across disks and networks surreptitiously.
Viruses have many different forms, but they all potentially have two phases to their execution: the infection phase and the attack phase.
◆ Infection Phase The virus has the potential to infect other programs when it executes. We often don’t clearly understand when the virus will infect the other programs. Some viruses infect other programs each time they are executed; other viruses infect only upon a certain trigger. This trigger could be anything: a day or a time, an external event on your PC, a counter within the virus, etc. Virus writers want their programs to spread as far as possible before anyone notices them.
Part A Theoretical study section
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Skill One Computer’s Virus
It is a serious mistake to execute a program a few times–find nothing infected and presume there are no viruses in the program. Maybe the virus simply hasn’t yet triggered its infection phase!
TSR (Terminate and Stay Resident) abbr. 终止驻留程 序 lurk v. 潜伏 resident virus 驻留的病毒
Resident viruses frequently take over portions of the system software on the PC to hide their existence. This technique is called stealth. Polymorphic techniques also help viruses to infect yet avoid detection.
Many viruses go resident in the memory of your PC in the same or similar way as TSR programs. This means the virus can wait for some external event before it infects additional programs. The virus may silently lurk in memory waiting for you to access a diskette, copy a file, or execute a program before it infects anything. This makes viruses more difficult to analyze since it’s hard to guess what trigger condition they use for their infection.
virus n. 病毒 surreptitiously adv. 秘密地 infection phase 感染期 attack phase 攻击期 infect v. 传染，感染 trigger n. 触发事
Project Seven The online shopping
mall’s security
新“ 世十 纪三 高五 职” 高职 专业 计教 算育 机国 应家 用规 技划 术教 专材 业 系 列 规 划 教 材
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Project Seven The online shopping
mall’s security
Part A Theoretical study section
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Training target: