Source code viruses are the least-common viruses because they are not only hard to write, but also have a limited number of hosts compared to the other types.
源码型病毒是最少见的病毒程序，因为它们不仅编写困难，而且与其他类型的病毒相比，受它们破坏的主程序数目也有限。
There are four main types of viruses: shell, intrusive, operating system and source code.
有四种类型的病毒程序：外壳型、入侵型、搡作系统型和源码型。
There are four main types of viruses: shell, intrusive, operating system, and source code.
有四种类型的病毒：外壳、入侵、操作系统和源码。
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