Plentiful evidence proves that the security of computer information system is weak.

越来越多的证据表明计算机信息系统的安全性是十分脆弱的。

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Computer virus is a great threat to the security of information system.

计算机病毒是信息系统安全的大敌之一。

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Computer virus is a great threat to the security of information system.

计算机病毒是信息系统安全的大敌之一。

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