At present, lectures are basically student-centered and face the judges, that is, I am both a student and a teacher. Generally, lots will be drawn before the lecture, and then there will be some time to prepare. The key depends on you: 1, whether the language expression is coherent and whether the thinking is rigorous and clear; 2. Whether the teaching attitude is generous; Are you familiar with textbooks? 4. The teaching design is error-free, which can reflect new educational ideas.