Like their biological namesakes, computer viruses replicate by attaching themselves to a host (a program, or a computer) and coopting the host's resources to copy themselves.

就像他们生物学中的同名物一样，计算机病毒复制时就是将自己俯身于宿主上（一个程序或是计算机），然后利用宿主的资源来复制自己。

youdao

This program can then execute qmail-queue as necessary, which might be useful, for example, to filter out email messages that contain viruses.

这个程序可以执行所需的qmail-queue，这可能会有用，来过滤哪些包含病毒的邮件消息。

youdao

Shell viruses wrap themselves around a host program and don't modify the original program．Shell programs are easy to write，which is why about half of viruses are of this type．

外壳型病毒将它们自己包裹在主程序的四周，对源程序不作修改。 外壳型病毒容易编写，这也正是约有一半病毒程序是这种类型的原因。

youdao

The anti-piracy software loaded onto the CDs was meant to stop illegal copying, but it was found that the program inadvertently made computers vulnerable to viruses.

FORBES: Lack's Sony BMG Offers Free Downloads In Settlement