cam chain

例句：

1. 1. The engineer designed a new cam chain for the machine.
   工程师为机器设计了一种新的链。
2. 2.The cam chain is responsible for controlling the movement of the piston.
   链子负责控制活塞的运动。
3. 3.The cam chain was used to improve the efficiency of the machine.
   链子被用来提高机器的效率。