当随机变量的均值为零时，这个解在第一象限上的积分值可简化为一个已知的结论。
When the mean of random variables is zero, the solution is shown to reduce a known result for the value of the integral over the first quadrant.
当随机变量的均值为零时，这个解在第一象限上的积分值可简化为一个已知的结论。
When the mean of random variables is zero, the solution is shown to reduce a known result for the value of the integral over the first quadrant.
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