链轮齿

例句：

1. 1. The car's engine is running smoothly because the chain has been properly adjusted.
   汽车发动机运行顺畅，因为链条已经调整得当。
2. 2. The old clock had a chain that broke after just a few years of use.
   这把旧时钟的链条在几年的使用后就断了。
3. 3. The engineer carefully replaced the chain wheel with a new one to ensure smooth operation.
   工程师仔细地用一个新的链条轮替换了旧的，以确保运转顺畅。