Passsage文章
Computer Virus计算机病毒
Professional Terms专业术语employee n.雇员essential a.本质的favorite a.特别喜爱的hire vt.雇佣integrity n.完整（性）intentionally ad.有意地intervention n.干预motive n.动机pervasiveness n.弥漫，蔓延replicate vt.重复subsequently ad.以下subtly ad.微妙的unaffected ad.未受影响的uninfected a.未受传染的virus a.病毒whatever n.不管怎样的，任何的What is a computer virus?何谓计算机病毒？A computer virus is one kind of threat to the security and integrity of computer systems.计算机病毒是危极计算机系统安全与完整的一种威胁。Like other threats ,a computer virus can cause the loss or alteration of programs or data.象其它威胁一样的是，计算机病毒可以引起程序或数据的丢失或改变。Unlike many other threats,a computer virus can be spread from program to program and from system to system without direct human intervention.与很多其它威胁不同的是，计算机病毒可以在没有人的直接干预下，从一个程序传播到另一个程序，从一个系统传播到另一个系统。
notes注意事项He was covered with snow from head to foot.他身上从头到脚都是雪。He stuck to his post from beginning to end.他自始至终一直坚守岗位。
