ni·sus /ˈnaɪsəs/
  努力,為達成目標的衝勁
  ni·sus /ˈnaɪsəs/ 名詞
  努力,奮發
  Ni·sus n.
  1. A striving; an effort; a conatus.
     A nisus or energizing towards a presented object.   --Hickok.
  2. Physiol. (a) The periodic procreative desire manifested in the spring by birds, etc. (b) The contraction of the diaphragm and abdominal muscles to evacuate feces or urine.
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  nisus
       n : an effortful attempt to attain a goal [syn: striving, pains,
            strain]