The teaching quality is high. Teacher Li Wenhui is a junior high school chemistry teacher of Dalian Keyuan Education Group. The teaching content is clear and the teaching links are progressive. Be good at activating classroom atmosphere and attracting students' attention; The teaching rhythm is compact, emphasizing the listening state of students, and students can digest the classroom content well, so the teaching quality is high. Mr. Li Wenhui is a famous teacher in Zhongshan District and a backbone teacher in Dalian, undertaking 6 scientific research projects at provincial, municipal and district levels. More than 500 students were admitted by world famous schools and domestic 985,211.