Time slack also had effects on the estimation of present task duration.

未来时间充裕感的程度也会影响人们对当前任务的预测。

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We also need to make sure that some effects have a duration.

另外一些效果会有持续时间。

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We also need to make sure that some effects have a duration.

另外一些效果会有持续时间。

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