Therefore, the university library network security problem becomes day by day important.

因此，高校图书馆网络安全问题变得日益重要。

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This article analyses main menaces to library network security, and describes the principles and application of the principal prevention techniques.

分析了目前图书馆网络所面临的主要威胁，论述了几种主要防范技术的原理和应用方法。

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