The tail of random variable's distribution is the focus of the risk analysis because the event with small probability often occurs in this area.
在风险分析中，随机变量的尾部一直是风险分析的重点，因为灾难事件往往就在这个区域里发生。
The mathematical models of probability of random event and fuzzy random event should be taken to analyze the reliability of a structure for these two kinds of limit state.
对这两种极限状态，应分别采用随机事件和模糊随机事件概率的数学模型进行其可靠度分析。
And the concept of the extension probability of random event element was also given on the basis of the study of the extension of random event element.
在对随机事元可拓性研究的基础上给出了随机事元的拓展概率的概念。
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