Usually hackers or computer virus intrude a computer system by security holes.
通常，计算机黑客和电脑病毒利用安全漏洞入侵计算机系统。
This computer is infected by a virus.
这台电脑感染病毒了。
What if the computer is infected by a virus.
如果计算机被感染病毒，那么，我该怎么办？
My computer was infected by a virus.
我的电脑受病毒感染了。
My computer was infected by a virus.
我的电脑受病毒感染了。
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