平均值、合计和其他类型的汇总数据无法通过仅仅使用一个映射函数来实现。
Averages, summations, and other summary types of data are not possible with just a map function.
一个变更账户(通常与移动账户一样，不过它无需通过movement函数生成)不能是一个合计账户—它必须存储数据。
A change account (usually the same as a movement account, although it doesn't have to be generated via the movement function) cannot be a summation account - it must store data.
嵌套的第二个SUM和EXTRACT函数组合计算下限，下限基于前面的片中的值的总数，在映射规则中表示为InSlice Index - 1。
The second, embedded combination of sum and EXTRACT function calculates the lower boundary, which is based on the sum of values in preceding slices, represented in the map rule as InSliceIndex - 1.
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