Day and night
Morning and night, Chinese idiom, Pinyin is Zhaoqi á nx ī D à ng, which means to be diligent and cautious all day long. From Yi Qian.
The origin of Idioms
Yi · Qian: "a gentleman works hard all day long. He is vigilant at night. He has no fault."
Idiom usage
He was loyal to his position. Chapter 18 of a dream of Red Mansions
Day and night
demolish with penetrating criticism - biān pì jìn lǐ
be cheap and at the same time very good - jià lián wù měi