joint bolt

例句：

1. 1.The car's engine is a complex assembly of parts that need to be joined together properly.
   汽车的发动机是一个复杂的部件组合，需要正确连接。
2. 2. The engineer used a special tool to tighten the joint bolts on the machine.
   工程师使用特殊的工具来紧固机器上的接头螺栓。
3. 3.The construction workers were carefully installing the joint bolts to ensure the structure was secure.
   建筑工人正在小心翼翼地安装接头螺栓，以确保结构稳固。