在此基础上，建立基于数学期望的任务预期完成时间预测模型，用具有最大期望完成时间的子任务预测任务预期完成时间；

Thirdly, it analyses prediction technology in scheduling, and proposes prediction model to predict task expected completion time using subtasks with maximum mathematical expectation.

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绝对进度，这个阶段是否在期望的时间内完成的？

Absolute progress. As measured by whether the phase completed within expected time frames.

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或许这是一个完全不能变动的时间表，同时，一些你期望在截止时间完成交付的事情可能现在不得不从你的计划中丢弃。

Maybe it's a timeline that absolutely can't be moved; at the same time, some deliverables you expected to accomplish by the deadline may now have to be jettisoned from your plan.

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