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每个线程对数据片做一件事情并将结果传给线上的下一个线程。
Each thread does one thing to each piece of data and passes the results to the next thread in line.
对于每个数据片，都执行第一个功能性映射调用，见图 19。
The first functional map call is executed for each slice of data and is shown below in Figure 19. The second argument in the call carries the index of the current slice
数据值分组为所谓的数据片，每个片提供对应于特定处理日期的数据集。
The data values are grouped into so-called slices of data, each of which provides a set of values corresponding to a particular processing date.
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