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.
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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