clapper pin

例句：

1. 1.The carpenter used a clapper pin to hold the boards together.
   木匠用一个扣件把木板固定在一起。
2. 2.The engineer designed a new clapper pin for the machine.
   工程师为机器设计了一个新的扣件。
3. 3. The tool was essential for the construction of the bridge, as it used clapper pins to secure the beams.
   这个工具对于桥梁的建设至关重要，因为它使用扣件来固定梁。