This paper presents the current situation of network security, then raises four types of security threats on network, finally, the author sets forth some measures to solve network security.
文章先对网络安全现状作一介绍，然后阐述网络面临的四种主要安全性威胁，并针对网络安全性提出了相应措施。
They defined and compared four types of efficiency measures with the goal of identifying the one that best represented human muscular efficiency.
他们定义并比较了四种不同的效率度量标准，以便寻找表示人体肌肉效率的最佳方式。
They defined and compared four types of efficiency measures with the goal of identifying the one that best represented human muscular efficiency.
他们定义并比较了四种不同的效率度量标准，以便寻找表示人体肌肉效率的最佳方式。
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