介绍了建立自然灾害保险风险分析的数学模型的方法；
The method of establishing the mathematics model to do the insurance risk analysis for the natural disaster is introduced.
这一研究表明，内集-外集模型用于自然灾害模糊风险评估，在期望值的意义上是一个可靠的模型。
This study demonstrates that, in the meaning of the expected value, the interior outer set model is reliable for calculating the fuzzy risk of the natural disaster.
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