tacker
  敲平頭頂的人,敲平頭釘器
  tacker
       n 1: a worker who fastens things by tacking them (as with tacks
            or by spotwelding)
       2: a sewer who fastens a garment with long loose stitches [syn:
           baster]
       3: a hand-held machine for driving staples home [syn: staple
          gun, staplegun]