chainwheel

例句：

1. 1. The chainwheel on the car's engine is responsible for turning the wheels.
   汽车发动机上的链条轮负责转动车轮。
2. 2. The engineer had to replace the chainwheel with a new one.
   工程师不得不用一个新的链条轮替换旧的。
3. 3. The chainwheel was designed to improve the efficiency of the machine.
   链条轮的设计旨在提高机器的效率。