If probability density functions of stress and strength are definite, stress strength interference model can be used to calculate reliability using formulation or numerical value integration.
应力、强度概率密度函数确定可采用应力-强度干涉模型，用公式或数值积分求可靠度。
Since the numerical integration algorithm can estimate concentrations within the area source, the user can enter any value for the minimum distance.
对于面源范围内部的浓度，模式可以通过数值积分算法进行估算，所以用户可以输入任意小的距离。
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