N a mathematical function to be integrated 被积函数
The vector surface integral equation can't be applied to numerical computation directly because its integrands possess the high order singularity.
矢量的面积分方程因其被积函数具有高阶奇异性，不能直接应用于数值计算。
There are two difficult points in convolution integral: how to determine the limit of the integral, and the integrands on the convolution integral.
确定卷积积分的积分限和在相应区间上的被积函数是计算卷积积分的两个难点。
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