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疲劳是人或动物对体力训练失去反应能力．内环境发生紊乱的具体表现，本文阐述了引起疲劳的几个主要原因．
Fatigue is the ability of a person or an animal to lose physical training. The specific circumstances of the turmoil within the environment, this article describes several of the main causes of fatigue.