puller
  拉的人,劃手,拉出器
  Pull·er n. One who, or that which, pulls.
     Proud setter up and puller down of kings.   --Shak.
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  puller
       n 1: someone who applies force so as to cause motion toward
            herself or himself
       2: someone who pulls or tugs or drags in an effort to move
          something [syn: tugger, dragger]