geared ring

例句：

1. 1. The car's engine is so loud that it canbe heard from a mile away.
   这辆车的引擎声音很大，可以传得很远。
2. 2. The old clock had a gearedring that could turn the hands of theclock.
   旧时钟有一个齿轮环，可以转动时钟的指针。
3. 3. The engineer used ageared ring to adjust the speed ofthe machine.
   工程师使用一个齿轮环来调整机器的速度。