fastener
  扣件,鈕扣,結紮工
  Fas·ten·er n. One who, or that which, makes fast or firm.
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  fastener
       n 1: a person who fastens or makes fast; "he found the door
            fastened and wondered who the fastener was"
       2: restraint that attaches to something or holds something in
          place [syn: fastening, holdfast, fixing]