change rapidly
Chinese idiom, Pinyin is j í R ú Xu á nzh ǒ ng, meaning as fast as turning a heel. It's changing fast. From the first chapter of machine theory.
The origin of Idioms
Feng Yongzhi of the Tang Dynasty wrote in the first chapter of Ji Lun: "one gains and one loses, it's easy to fall back on one's hands, one rises and one dies, it's as fast as one's heels, is it not the duty of the state?"
Idiom usage
It can be used as a predicate or adverbial to describe things changing rapidly
change rapidly
month after month and year after year - jīng nián lěi yuè
A thousand miles of divine friendship - qiān lǐ shén jiāo
It's better to see it in person than to hear it - chuán wén bù rú qīn jiàn