给出了四维坐标变量的几率密度函数公式，并简述了相应的抽样方法。
The probability function for the four dimensional new variables are derived and the sample procedures f…
然而，该函数的简单二维密度绘图马上给我们一种清晰的感觉，那就是在原公式中包含的简单而漂亮的对称结构。
However, a simple two-dimensional density plot of this function immediately gives us a good feeling for the simple and beautiful symmetry contained in the original formula.
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。
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.
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