按计算机病毒入侵系统的途径可将计算机病毒分为源码病毒、入侵病毒、操作系统病毒和外壳病毒。
According to a computer virus intrusion system approach can be divided into source virus, computer virus virus, operating system viruses and shell viruses.
首先，写一个全球个人电脑都容易收到感染的病毒会比去写一个很少人使用的操作系统病毒更为有效率。
For one, writing nastiness that the vast majority of the world's personal computers are susceptible to is a more efficient use of resources than writing the same evil for a sliver of the population.
病毒已使他的计算机操作系统受到传染。
The virus has infected the operating system of his computer.
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