The point in time that work actually started on a schedule activity.
一项计划活动的工作实际开始的时间点。
The activity description normally describes the scope of work of the schedule activity.
活动描述通常用来说明活动的工作范围。
Multiple attributes associated with each schedule activity that can be included within the activity list.
列入活动清单中的每一项计划活动所具有的多重属性。
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