我们会讨论这个在随后的课堂中，但是假设就是你们已经有了一个初始的事故，就是一个管道破裂发生了。
And we'll talk about this in a subsequent lecture but the assumption is you have an initiating event which happens to be a pipe break.
在结构寿命的初始阶段——施工阶段结构的风险概率最大，如果处理不当，很容易导致安全事故的发生。
On the early stage of the structural life-construction, the structural risk probability gets the maximal point. The safety accident will happen if the unseemliness way is adopted.
初始调查显示该攻击型潜艇事故包括一处空气净化系统，其首部受到轻微损害。
Initial investigations indicated that the accident aboard the hunter-killer submarine involved a piece of air purification equipment in its forward section. It caused only superficial damage.
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