计算机病毒是一些由人设计的能潜入你的计算机，能自我复制，能扩展到其他计算机上并通常能引起一些症状的偷偷摸摸的程序。

• Computer viruses are sneaky programs designed to insinuate their way into your computer, copy themselves, spread to other computers and, usually, cause a few symptoms.