男孩表现不如理想可能是因为他们接受了老师认为他们比女孩成绩稍逊的看法，而缺乏努力的动力。

Boys may underachieve because they pick up on teachers' assumptions that they will obtain lower results than girls and have less drive.

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但是，大多数情况下，你却仍因为它缺乏挑战、无须付出努力而挂断，然后伤心地离开。

But, more often than not, you only hang it up and turn away saddly just because of its lack of challenge and effort.

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当人们有压力、因为努力而疲惫或者缺乏睡眠时，人们的持久力也会减低。

Task persistence is also reduced when people are stressed or tired from exertion or lack of sleep.

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