How to prevent students from tripping in class?

This is very simple, you can detour or slow down!

If it is a classmate's prank, it depends on what kind of classmate you are targeting. If he is naughty and doesn't listen to the teacher,

Be careful next time and don't have any contact with him again. Such a classmate, you should not go to the teacher to complain, which will not only solve the problem, but also make it more serious!

If he is naughty but afraid of the teacher, you can talk to the teacher or your parents. ...

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