All right. Peng Ze is the main teacher who studies primary school mathematics. The proposer of the national cup and junior high school examination, master of Chinese Academy of Sciences, 16 years of mathematics teaching experience, covering all grades of primary school, junior high school and senior high school, has many teaching experiences and good teaching quality, so Mr. Peng Ze has a good mathematics course in junior high school. Ethnic junior high school is the abbreviation of primary school students entering junior high school.