Yu Yixin, Wang Chengshan, Fang Dazhong, Jiang Xiaodong and Wang Shouxiang are all famous people! Among the young mentors, Jia, Zhao Jinli and Zeng Yuan are all excellent. Whether tutoring is good or not depends on the ability on the one hand and the students on the other. The old professor may have too many students to personally guide each student. Now I choose Jia as a young, promising, modest and amiable cow tutor, and the future is boundless.