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。
All three volumes are full of source code for viruses, including both new and well known varieties.
所有三本书里都充满了病毒的源代码，包括已知的著名病毒和新病毒。
All three volumes are full of source code for viruses, including both new and well known varieties.
所有三本书里都充满了病毒的源代码，包括已知的著名病毒和新病毒。
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