mortice wheel tooth

例句：

1. 1. The dentist uses a mortice wheel to remove the old fillings.
   牙医用一个锯齿形轮子来去除旧的填充物。
2. 2. The car's engine has a mortice wheel that helps it run smoothly.
   这辆车的引擎有一个锯齿形轮子，帮助它平稳运行。
3. 3. The baby was teething and needed to be fed frequently.
   婴儿正在出牙，需要频繁喂食。