这里应该指出，偶尔会出现breakback的数据总数输入在单元格中不会产生整数。
It should be noted that there may be occasions where the data total input for breakback does not result in integer data in cells.
num_log_span(默认值是0)——指定在一个工作单元中可以跨越的活跃日志总数。
Num_log_span (default: 0) - Specifies within a unit of work the total number of active logs that can be spanned across.
计算行的总数就是在len (s)语句中返回的清单元素的数量。
Counting the total number of lines is simply the number of elements in the list returned with the len (s) statement.
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