日乾夕惕

Explanation: Hard to describe care from morning to night, nose to the grindstone. Dry, self-improvement appearance; vigilant, cautious. 　　Source: Phrase from the "easy to do": "Gentlemen Dry all day, if Ti Xi Li, Without Harm." 　　Examples: Good cut by the major political pro, ~. ★ Qing Chen Kangqi "Lang Ji Wen Qian," Volume