tri·cy·cle /ˈtraɪsəkəl, ˌsɪkəl/
  三輪車,機器三輪車
  Tri·cy·cle n.  A three-wheeled velocipede. See Illust. under Velocipede.  Cf. Bicycle.
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  tricycle
       n : a vehicle with three wheels that is moved by foot pedals
           [syn: trike, velocipede]