return crank

例句：

1. 1. The car's engine cranked up as soon as I started the engine.
   我一启动发动机，汽车的引擎就发动了。
2. 2. The old man used to use a crank to turn his wheelchair.
   这位老人过去常常用曲柄来转动他的轮椅。
3. 3. The crank of the clock was the only thing that moved when the lights went out.
   当灯光熄灭时，只有钟的曲柄在动。