Then each of four different types of shrinkage cracks 'characteristics has been analyzed, as to different characteristics of shrinkage cracks, the author proposed corresponding control measures.

分别对四种不同的收缩裂缝特性进行具体分析，并针对不同特性的收缩裂缝提出了相应的防治措施。

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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。

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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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