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。
The motor on the spot is in operation in the random failure period and therefore its failure rate is approximately a constant.
它们预示着使我们的体系结构、我们的代码、我们的操作手册失效，最糟糕的是，使我们将偶然的知识替换为深入技能的能力失效。
They threaten to invalidate our architecture, our code, our operations manuals and, worst of all, our ability to substitute casual knowledge for deep skills.
而油罐进油管设计欠合理则是造成偶然性失效的原因。
The reason for the accidental failure lies in the unduely designed inlet pipe to the tank.
应用推荐