Only water is allowed to go to the toilet after 10 minutes

Only water is allowed to go to the toilet after 10 minutes

I don't know when children's games such as rope skipping, house skipping, shuttlecock kicking, and marbles disappeared in the campus. Except for physical education, there were no students running and jumping on the playground, and many schools were silent after 10 minutes of recess.   "The maximum radius of students' recess activities: the aisle outside the classroom" "the children who have...