What's on the wall of the classroom? What else?

The front wall of the classroom is a blackboard, which is a tool for teachers to teach and educate people, and an empty space for expressing textbook knowledge.

The left and right walls are patriotic slogans of the school and portraits of patriotic heroes of the country, so that students should be patriotic from an early age and be useful to the country.

on the back wall is the class blackboard newspaper, which is revised once a week or once a month.