Vygotsky, the "zone of proximal development", believes that there are two levels of students' development: one is the current level of students, which refers to the level of problem-solving that can be achieved when they are independent; The other is the possible development level of students, that is, the potential gained through teaching. The difference between them is the nearest development zone. Teaching should focus on students' recent development zone, provide students with difficult contents, arouse students' enthusiasm, give full play to their potential, surpass their recent development zone and reach the level of the next development stage, and then carry out the development of the next development zone on this basis.

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