sharp·shoot·er /ˈʃɑrpˌʃutɚ/
  射擊名手,神鎗手,狙擊兵
  Sharp·shoot·er n. One skilled in shooting at an object with exactness; a good marksman.
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  sharpshooter
       n 1: an athlete noted for accurate aim
       2: someone skilled in shooting [syn: marksman, crack shot]
       3: a fast schooner once used by New England fisherman for
          illegal fishing in Canadian waters