toothed gearing

例句：

1. 1.The new car has a toothed gear system that makes it more efficient.
   这款新车采用了带齿的齿轮系统，使其更加高效。
2. 2.The old machine had a toothed gearing that was difficult to adjust.
   这台旧机器的带齿齿轮很难调整。
3. 3.The dentist replaced the old toothed gearing with a new one.
   牙医用新的带齿齿轮替换了旧的。