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.

youdao

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.

youdao

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.

youdao