积分值的一种重要方法是变量代换法。
An important method for evaluating integrals is a change in variables.
本文利用变量代换法导出了向无损耗空间辐射的，尺寸相同和不相同的平面缝隙辐射元互导纳的通用计算公式。
General formulas are derived for calculating mutual admittance of planar slots radiating into a lossless space by making use of change of variables.
高等数学题目类型繁多，解题方法灵活多变，其中代换法不但能开拓灵活巧妙的解题思路，而且有化难为易、化繁为简之功效。
Due to the variable subjects and methods of solving problems in Higher Mathematics, substitution will not only flexibly develop the ways of problem solving, but also an effect of simplification.
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