hand-operating crank

例句：

1. 1. Thenew car features a hand-operated crank for easy starting.
   这款新车配备了一个手操作曲柄，便于启动。
2. 2. The old clock had a hand-operated crank that was hard to find.
   旧时钟有一个手操作曲柄，很难找到。
3. 3.The engineer used a hand-operated crank to adjust the gears.
   工程师使用手操作曲柄来调整齿轮。