gearlever

例句：

1. 1. The car's engine is powered by a powerful gearlever.
   这辆车的引擎是由一个强大的齿轮装置驱动的。
2. 2. The old clock had a gearlever that was worn out.
   旧钟表有一个磨损的齿轮装置。
3. 3.The new invention uses a gearlever to make the machine run more efficiently.
   这项新发明使用了一个齿轮装置来使机器运行得更加高效。