common knowledgennoun: Refers to person, place, thing, quality, etc.
([sth] that most people know)
常识 cháng shí
尽人皆知的事 jìn rén jiē zhī de shì
It was common knowledge among the staff that Bill had a drinking problem. Though Galileo was persecuted for saying this in the 17th century, it is now common knowledge that the earth orbits the sun.