By grasping the influence of language on mathematics, we can clearly understand the relation between language and mathematics so as to form the whole cognition of mathematics concept.
把握语言对数学的影响，从而更清楚地认识语言和数学之间的关系，形成对数学概念的整体认知。
In this paper the author tries to deduce variation by the method of mathematics reasoning. It will be very helpful for us to understand variation.
借助数学推导对档差进行推理、演绎，有助于对档差大小的理解。
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