对牛弹琴

Explanation: Mock-abiding people do not know what the other is right. To laugh at people who do not speak audience. 　　Usage: Partial official; as predicate, object; containing derogatory, used to ridicule others 　　Source: Mu Rong Han, "Doubts": "Gong Mingyi bomb clearance angle for the cow parade, and fell as before eating, non-cattle do not smell, are not carry on its ear." 　　Examples: ~, Cattle ear to, yelled very good, we again afterwards for a total! (Ching Li when Jane "Flowers in the Mirror" Ninety-back) 　　Riddle: Shepherd erhu Thesaurus:  No one save a hundred, hit out at random, Bovine drum spring, waste one's words, make a very wild boast about sth. as if it were raining flowers, Tiannvsanhua, 3 Paper no ass Antonym Group:  teach students according to their aptitude, suit the medicine to the illness, Symptomatic Dispensing, shoot the arrow at the target, take measures in time