为此，本文提出了一种改进的近似解析离散化方法(ONADM)。
The NADM is improved and an optimum nearly analytic discrete method (ONADM) is presented in this study.
离散化之后，得到年超越概率的综合表达式及其相应的解析近似。
After their discretion, it is possible to obtain the expression and analytical approximation for the annual probability of exceedance.
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