求翻译： Both worms and viruses are self-replicating; but, while a worm is a free-standing program, a virus must attach to another program to spread.是什么意思？

待解决

悬赏分：1 - 离问题结束还有

 Both worms and viruses are self-replicating; but, while a worm is a free-standing program, a virus must attach to another program to spread.

问题补充：

匿名	2013-05-23 12:21:38 两个蠕虫和病毒的自我复制，但蠕虫是一个独立的程序，必须重视病毒传播到另一个程序。

匿名	2013-05-23 12:23:18

匿名	2013-05-23 12:24:58

匿名	2013-05-23 12:26:38

匿名	2013-05-23 12:28:18

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