通常将自我报告的持续存在1个月或1个月以上的疲劳称为长时间疲劳(prolonged fatigue)；持续或反复发作6个月或更长时间的疲劳称为慢性疲劳(chronic fatigue)。
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记住长时间工作会让他们感到疲劳，所以要对他们有耐心。
Remember that working long hours can make them tired, so be patient with them.
女人总将长时间的疲劳归因于贫血，自以为多摄入点铁元素就没事了，但是这样做弊多利少。
Being tired all the time is often put down to anaemia and women think they should take more iron, but that could do more harm than good.
缺少阳光，长时间在室内呆着会容易让人感觉到疲劳，研究证明阳光可以刺激大脑内的化学物质从而达到愉悦心情的效果。
Research suggests that light stimulates brain chemicals that improve mood.
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