overexertion
  用力過度
  over·ex·er·tion /-ˈzɝʃən/ 名詞
  運度負荷
  O·ver·ex·er·tion n. Excessive exertion; as, he strained his back from overexertion.
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  overexertion
       n : excessive exertion; so much exertion that discomfort or
           injury results