com·mut·er /kəˈmjutɚ/
  使用月季票上下班者,通勤者
  Com·mut·er n. One who commutes; especially, one who commutes in traveling.
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  commuter
       n 1: a passenger train that is ridden primarily by commuters
            [syn: commuter train]
       2: someone who travels regularly from home in a suburb to work
          in a city