fastener

名词 fastener:

1. a person who fastens or makes fast
2. restraint that attaches to something or holds something in place
   同义词：fastening, holdfast, fixing

1. A slim, pointed piece of metal hammered into material as a fastener.
   钉子，图钉一细的尖头金属，用于楔入某物，如图钉
2. He's nipped his thumb in the fastener.
   他的姆指被钩扣夹住了。