Central South University enjoys a high reputation in China. Professors in famous universities are very good. With the continuous progress of society and the advancement of school education, more and more high-tech products appear in the classroom. However, an old professor insisted on writing on the blackboard in class for 26 years. The professor wants to stick to his teaching style and doesn't want to go with the flow. Moreover, he has rich knowledge and experience, and all the knowledge points are kept in his mind. He can deduce the formula on the blackboard by himself, and there is no need to write it in PPT.

The professor thinks that the theoretical knowledge of mechanics is abstract, and many knowledge points will be difficult for students to understand, so he wants to guide students into the ocean of knowledge step by step by handwriting. Although teachers like to put all the reasoning processes in PPT, students have no desire to appreciate them at all. Their attention is likely to be attracted by the exquisite PPT pattern, that is, they don't pay attention to the formula, so that the children ignore the focus of this lesson. Moreover, the formulas in the book are very rich, but students still insist on coming to class, so it is very important to explain the significance of writing on the blackboard, and the teacher's teaching process can inspire them.

Because he doesn't want to rely on PPT all the time, with the help of these tools, the teacher won't prepare lessons seriously. A course PPT can be provided to many teachers, but these are not the teachers' own ideas, so there will be limitations. This teacher is older. He is a mentor to students. He can combine knowledge points with things in real life to help children understand better.

The teacher wants to make students think hard by writing on the blackboard. Because he will have enough time to think when writing, but the content on PPT is written in advance. Teachers can't control time, which may make students more nervous and impatient.