道边苦李

Explanation: Analogy mediocre, useless before. 　　Usage: Partial official; as subject, object; refers to mediocrity 　　Source: Southern Song Liu Yiqing "Shi magnanimity": "Rong-year-old, try and visit all children, more children watch alongside plum broken branches, taken from various children walking, only Rong fixed. People asked, The answer was: 'tree in the road and many children, this will be hard Lee,' and then take the letter. " Thesaurus:  Highway rhamnus, Futility Zhicai