若把二值图或灰度图看作是二维密度分布函数，就可把矩技术应用于图像分析中。
The use of moments for image analysis is straightforward if we consider a binary or gray level image segment as a two-dimensional density distribution function.
二维正态分布函数值的计算是估算串联结构体系失效概率上、下限的一项重要内容。
It is an important aspect to compute the two dimensional distribution in estimating the bounds of failure probability of series structures.
本文给出二维疲劳裂纹扩展门槛值分布函数，建立二维应力—门槛值干涉模型。
A distribution function of two dimensional threshold is given for fatigue crack propagation.
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