So the task duration is not a single real number, rather it is a random variable that describes the likelihood of completion within a certain range of time.
所以任务持续时间不是一个单一的实数，而是描述一定时间范围内完成的可能性的随机变量。
There might be no single "real reason" - actions can have multiple motives.
可能没有单一的“真正原因”——行为可能有多种动机。
There might be no single "real reason" - actions can have multiple motives.
可能没有单一的“真正原因”——行为可能有多种动机。
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