一个项目经理通过计算项目组成员提供的活动历时估算的加权平均值来得到活动历时。
A project manager obtains weighted average duration estimates from the team to aciculate activity duration.
CPM的活动历时估算通常以历史数据为基础，并且采用以往项目活动历时的平均值。
With CPM, estimates of activity durations are based on historical data and are assumed to be the mean or average time that the activity has taken to perform in the past.
把以后几年冬季要发生的所有活动的估算历时都加长。
A. Lengthen the estimated activity duration for all activities scheduled to occur the following winter.
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