arm base pin

例句：

1. 1.The engineer used a special arm base pin to fix the machine parts together.
   工程师使用一种特殊的臂基销将机器零件固定在一起。
2. 2.The carpenter inserted a new arm base pin to replace the worn one.
   木匠插入一个新的臂基销来替换磨损的销子。
3. 3. The technician carefully removed the old arm base pin and replaced it with a stronger one.
   技术员小心地移除了旧的臂基销，并用一个更坚固的销子替换它。