再举个例子，中国前几年试图从以色列获得空中预警和控制系统但遭美国阻拦。
One more example, a few years ago, China tried to procure a couple of AWACS from Israel which eventually blocked by the US.
预测建筑安全事故的发展趋势，为制定企业安全政策和安全预警控制系统具有重要的参考意义。
To predict the development trend of the building safe trouble, for drawing up enterprise security policy and safe early warning control system , has important reference meaning.
该装置由预警系统、脱离及切断系统、卡紧机构和液压控制系统等组成，对其强度校核计算进行了简要介绍。
This system includes alarming system, releasing and cutting system, locked equipment and hydraulic-pressure controlling system, and the calculation of intensity is briefly introduced.
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