英语翻译Antivirus software uses several techniques to find virus

英语翻译
Antivirus software uses several techniques to find viruses .Some viruses (attach) themselves to an exising program .The presence of such a virus often increases the length of the (original) program .The earliest antivirus software simply examined the programs on a computer an recorded their (length) .A change in the length of a program from one computing session to the (next) indicated the possible presence of a virus.
To counter early antivirus software ,hackers became more cunning .They (created) viruses that insert themselves into unused portions of a program file without (changing) its length .Antivirus software in an uninfected application program and (calculates) a checksum .A checksum is a number calculated by combining the binary values of all bytes in a file .Each time you (run) an application program has change ,the (ckecksum) will be different ,and the antivirus software assumes that a virus is present.
Today’s viruses ,Trojan horses ,and worms are not limited to (infecting) program files ,so modern antivirus software attempts to locate viruses by (searching) your computer’s files and memory for virus signatures .A virus signature is a section of the virus program ,such as a unique series of instructions ,that can be used to identify a known virus.

反病毒杀毒软件使用一些技术来查找病毒.一些病毒自动连接现存程序.这类现存的病毒经常会增加原有文件程序数据的长度.这时原先的杀毒软件就可以很简单的检测这台电脑的程序,并且记录程序的长度.一个程序从一段时间到另一段时间内程度的变化就可以断定现存病毒的最可能的名称.
为了应对早期的杀毒软件,黑客们变得更加狡猾；他们制造出一种自动植入文件程序中未使用部分且不改变文件长度的病毒.杀毒软件存在于为感染的应用程序中,对程序进行长度计算及校验.校验的结果是结合二进制值及所有文件中的字节而计算出的数字.每当你开启的应用程序被篡改,校验值就会改变,此时杀毒软件就会假定出现病毒.
当今的病毒包括木马病毒,蠕虫病毒,这些病毒可以无限的感染你的程序文件,所以现代的杀毒软件尝试着通过搜查你的电脑文件和对病毒名称的记录来定位病毒.病毒名称是病毒内部程序的一部分,正如一系列独特显著的指示特征,它们可以用来确定病毒名称.
相关单词：
反病毒的：antivirus
在场的,存在的：presence
一段时间：session
应对：counter
黑客：hacker
狡猾奸诈：cunning
部分：portion
未感染的：uninfected
校验：checksum
二进制值：binary values
字节：bytes
假定：assume
特洛伊木马：trojan horses
定位：locate
签名,署名：signature
独特的：unique
鉴定,辨认：identify
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