戴天履地

Explanation: Dai: Braving days; shoe: riding, riding. Days of his head, foot to the ground. Between people living in the world to describe. Analogy End breadth and depth, such as wet behind the ears. 　　Source: "Zuo Xi Public fifteen years," said Jin Dafu three worship Jishou 'wear a heaven Houtu Jun Lu, Coldest Winter in Peking, real King and talk. Ministers dare to leeward. '"