曲柄

qū bǐng yáo gǎn jī zhì

曲柄摇杆机制

crank and rocker mechanism

tā kāi shǐ zhuàn dòng qū bǐng jiāng yú juǎn shōu shang àn

她开始转动曲柄将鱼卷收上岸。

She began to turn the crank to reel in the fish.

lì yòng qū bǐng fā dòng yǐn qíng

利用曲柄发动引擎

crank an engine