在历史洪水存在不确定性情况下，以概率权重矩法估计的参数稳健性优于优化适线法。
Moreover, under the situation of uncertainties in large historical flood, the quantities estimated by probability weighted moments may be more robust than those by a optimal curve fitting method.
现有的结构优化设计模型绝大多数是针对确定性情况下的优化，对工程结构的可靠度考虑不多。
Among the existing optimum design models, majority only aim at the optimization which just in the definite conditions and the factor of structural reliability is ignored.
现有的优化设计模型，绝大多数是针对确定性情况下的优化，将工程实际中大量存在的模糊性因素忽略不计；
Among the existing optimum design models, majority only aim at the optimization which just in the definite conditions and ignore the fuzzy factors which exist in practice widely.
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