在透视表公式中不能输入对分类汇总和数据项的引用。
References to subtotals and data items cannot be entered into PivotTable formulas.
所谓数学解释，就是以某种方法对数学某一分支或者构成它的成分，诸如概念、命题、公式、符号等所赋予的各种意义的总和。
The so called maths summary is to summarize, by a certain way, the various meanings of a branch of its structural element such as conception, proposition, formula and sign etc.
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