To tire with physical or mental exertion; weary.

使疲劳因身体或精神费力而疲劳；

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Through this kind of mental exertion, he says, people can keep their memories whole into their 80s and 90s.

他说，通过这种精神锻炼，人们可以让记忆一直完整地保持到八九十岁。

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When your spiritual energy is in balance, the healing energy you send forth to others flows easily and effortlessly, without physical or mental exertion.

当你的灵性能量在平衡中时，你对别人发出的疗愈能量会流动的很轻松不费力，不需要物理或精神上的努力。

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These experiments showed no activity in either the amygdalas or the pACC, suggesting that the earlier results were indeed the result of social stress rather than mental exertion.

ECONOMIST: Urban brains behave differently from rural ones

Because of the mental and physical exertion required, climbing the ridge alone is suggested as a two-day trip, with one day used as a training day.

BBC: A death-defying ride along Scotland��s Cuillin Range