pe·dom·e·ter /pɪˈdɑmətɚ/
  步數計,步程計
  Pe·dom·e·ter n.  Mech. An instrument for including the number of steps in walking, and so ascertaining the distance passed over.  It is usually in the form of a watch; an oscillating weight by the motion of the body causes the index to advance a certain distance at each step.
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  pedometer
       n : measuring instrument for recording the number of steps taken
           in walking