细菌来源主要有自身感染和外来感染两种。
Bacteria have their own main sources of infection foreign infection two kinds.
一个蠕虫是一个复制自身但并不感染宿主的程序。
A worm is a program that multiplies itself but that does not infect the host.
一个蠕虫是一个复制自身但并不感染宿主的程序。
A worm is a program that multiplies itself but that does not infect the host.
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