We must not run in the hallways.

我们不允许在走廊里奔跑。

同一单元的其他句子

• Don't eat in the classroom, please.请不要在教室里吃东西。
• Can I listen to music in class?我可以在课堂上听音乐吗？
• You have to wear the school uniform.你必须穿校服。
• Don't be late for school.上学不要迟到。
• Please be quiet in the library.在图书馆请保持安静。