lún
车轮
chē lún
wheel
齿轮儿
chǐ lún er
gear
三轮摩托车丨比喻用法历史的巨轮。
sān lún mó tuō chē | bǐ yù yòng fǎ lì shǐ de jù lún
Three-wheeled motorcycle | Metaphorical usage: the great wheel of history