In analyzing the reliability of a mechanism, how to get the statistic characteristics of the relating random parameters in a failure model is a difficult problem.
在进行机构可靠性分析时，如何求失效模式中有关随机量的统计特征是一个难点。
There are lots of discontinuities whose geometry exhibits a random behavior in rock excavated slopes, and the failure surface of the slope is normally consisted of the joints and rock-bridges.
岩石边坡开挖中存在大量的随机结构面，结构面与岩桥的组合破坏是边坡破坏的一种重要形式。
The motor on the spot is in operation in the random failure period and therefore its failure rate is approximately a constant.
现场使用的电机基本运行在偶然失效阶段，因而其失效率近似为一常数。
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