I can't forget the emotional changes of the author about two street performers, one old and one young.

At first, the author studied the old one curiously, and then doubted their intention to play erhu in the street. When I was about to leave, I felt sorry for the old one, so I went back to give them some money to help them. But when he was rejected, the little girl's words touched the author, made him feel ashamed, and at the same time bred a sincere admiration in his heart. This paper mainly expresses the praise of this old and young man through the change of the author's mentality.