connecting pin

例句：

1. 1. The car's engine needs to be connected to the transmission.
   汽车的发动机需要连接到变速器上。
2. 2.The engineer used a connecting pin to fix the broken part of the machine.
   工程师使用一个连接销来固定机器损坏的部分。
3. 3.The scientist used a connecting pin to connect two circuit boards together.
   科学家使用一个连接销将两个电路板连接在一起。