1. A nail, screw, or bolt for clinching. 
   铆钉用于固定的钉子、螺丝或螺丝钉
2. To drive(a screw or bolt) into a countersink. 
   将钻或螺栓置入埋头孔
3. a small square or hexagonal metal block with internal screw thread to be fitted onto a bolt. 
   内侧有螺纹儿、可以被固定到螺栓上的方形或六边形金属块。
4. A wood screw will fill the breach until you can buy the proper bolt for the job. 
   在你能够买到合适插销以前，先用一枚木螺丝替代一下。
5. A hole with the top part enlarged so that the head of a screw or bolt will lie flush with or below the surface. 
   埋头孔顶部扩大的孔，为使钻或螺栓的头与地面相平或在地面以下

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