There is, however, a definite structural variation between the male and female brain.

然而，男性和女性的大脑确实存在结构上的差异。

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Thus, when the permeability of 50% probability and the coefficient of variation for lognormal distribution are known, one can establish a definite numerical model of permeability plane distribution.

这样，知道模型的渗透率对数正态分布概率50%处渗透率和变异系数，就可以建立起确切的渗透率平面模型。

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This article studies the optimal policy of production-inventory model in which time cycling is limited and cost parameter varies in stepped variation, and the definite way of cost parameter.

本文研究时间周期有限，费用参数呈阶梯变化的生产-库存模型的最佳策略及参数的确定途径。

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