在学校，你不应该和同学打架，不应该在走廊上跑，或在课堂上吃零食。
You shouldn't fight with your classmates, run in the hallways, or eat snacks in class at school.
大明经常和同学打架。
隔壁宿舍的两位同学打架，我和室友跑去拦架。
Two students were fighting in another dormitory, my roommate and I rushed to break them up.
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