There are two main types of viruses: shell, intrusive.
主要有两种病毒：shell病毒和instrusive病毒。
Viruses only contain a shell of protein and some DNA and RNA genetic makeup materials.
病毒只有一个蛋白质外壳和一些DNA和RNA这样的遗传物质。
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。
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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