In computer technology, a virus is a program that introduces itself into a system, altering or destroying the information stored in the system.
双语例句
例： Hackers are said to have started a computer virus.
据说黑客们已经开始传播一种新的电脑病毒。
例： By the time a virus is detected it will almost certainly have infected other disks.
等检测到病毒时，几乎可以肯定其它磁盘也已经被感染了。