Subjects and Methods The data of this paper was collected by both household surveys and face-to-face interviews.

研究方法本研究资料主要来自对居民的家庭入户调查和访谈。

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Subjects and methods: Beijing Sports University in the women's wrestling team's 16 players for the study, including 10 master athletes, six-level athletes.

研究对象与方法：以北京体育大学女子摔跤队的16名队员为研究对象，其中健将10名，一级运动员6名。

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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。

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