嘤其鸣矣，求其友声

Explanation: Trained, the sound of birds. Birds chirping in the trained, trained to seek companions crashed. Metaphor for like-minded friends. 　　Source: "Book of Songs Xiaoya logging" trained its ming men, seeking their friends sound. He is a bird with men, and still find You-sheng; moreover Iraqi men, not for sheng. " 　　Examples: "Book of Songs," said the ~. "It is precisely in such times. ★ Mao Zedong," Stalin is the friend of the Chinese people. "