driving crank

• 主动曲柄,织曲柄

driving crank的用法和样例：

例句

1. My car's so old that I have to crank it.
   我的车太旧了，我只好转动曲柄来发动它。
2. The pedal of a cycle is attached to a crank.
   自行车的踏板与曲柄相连。