Day and night
Chinese idiom, Pinyin is zh ā och é NGX ī Hu ǐ, which means to describe the speed of renovation. It's from Imperial science policy.
The origin of Idioms
Su Shi, Song Dynasty, wrote the imperial policy of trial production. "The cost of the imperial palace is no less than that of the enemy country. The work of the imperial palace is made day by day and is destroyed day by day, so as to make it new."
Idiom usage
As an object or attributive, it means to change quickly.
Day and night
Honest officials can cut off housework - qīng guān nán duàn jiā wù shì
price oneself out of the market - mán tiān yào jià