The model mainly involves the small deviation linearization method.
在模型建立中，主要采用了小偏差线性化的处理方法。
Large deviation theory provides a good method to calculus the probability of rare event, which will have great impact once it happens although its probability may be very small.
大偏差理论提供了一个很好的办法来计算小概率事件的概率，尽管这种事件发生的概率可能会很小，但是一旦发生将会产生巨大的影响。
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