In school, we can see flowers and grass everywhere. But there will always be people trampling on them. The teacher told them that the leaders taught them, but in the campus, there will be some bare grass.
So I suggest the school do this. I found someone trampling on the lawn, talking about the radio exercise, and then investigating, if someone came out to investigate, asked him if he had trampled on the lawn. If he admitted, he told him not to do so in the future. If he did not admit it, he would be given the harshest punishment.