ex·ert /ɪgˈzɝt/
  (vt.)發揮,運用,施以影響
  Ex·ert v. t. [imp. & p. p. Exerted; p. pr. & vb. n. Exerting.]
  1. To thrust forth; to emit; to push out. [Obs.]
  So from the seas exerts his radiant head
  The star by whom the lights of heaven are led.   --Dryden.
  2. To put force, ability, or anything of the nature of an active faculty; to put in vigorous action; to bring into active operation; as, to exert the strength of the body, limbs, faculties, or imagination; to exert the mind or the voice.
  3. To put forth, as the result or exercise of effort; to bring to bear; to do or perform.
     When we will has exerted an act of command on any faculty of the soul or member of the body.   --South.
  To exert one's self, to use efforts or endeavors; to strive; to make an attempt.
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  exert
       v 1: put to use; "exert one's power or influence" [syn: exercise]
       2: of power or authority [syn: wield, maintain]
       3: make a great effort at a mental or physical task; "exert
          oneself"