joint of costal head

例句：

1. 1. The joints in the arm are responsible for supporting the weight of the upper body.
   手臂的关节负责支撑上身的重量。
2. 2. The scientist discovered a new way to join two pieces of metal together.
   科学家发现了一种连接两块金属的新方法。
3. 3. The car's engine is connected to the transmission with a joint.
   汽车的引擎与传动装置通过一个接头相连。