But at this moment we cannot calculate the work item status because it may contain sub-work items, so we need to declare two global variables to store these values.

但是此时，我们不能计算工作项的状态，因为它可能包含了子工作项，这样我们需要声明两个全局变量，以存储这些值。

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There's another subtle advantage, if you follow a pretty common practice to store HTML files in sub-directories.

如果您按照十分常见的实践将 HTML 文件存储在子目录中，则还有另一个小小的优点。

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After 24 pages we reach a much better design, which mainly USES a map to store properties rather than sub-classing for each type of instrument.

在24页之后，我们看到了更好的设计，主要用map来存储属性，而不是为每种乐器类型建立子类。

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If it is unable to either shift from the big-box retail format to smaller stores, or optimize store space by sub-leasing to other businesses, operating costs will not come down.

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In fact, the serviceman may be sub-contracted which means the store would not have that much control on the quality of the workmanship due to lack of accountability.

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Unofficially referred to as "Sub-Zero, " the facility will store a copy of the social network's data in case its primary servers need to be restored in an emergency.

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