You mustn't pack your school bag when you hear the fire bell.保持原意怎么改?
问题描述：
You mustn't pack your school bag when you hear the fire bell.保持原意怎么改?
这句话我不懂,回答的,顺便也把它的意思写出来吧,还有保持原意的句子.
答
You mustn't pack your school bag when you hear the fire bell.
当你听到火铃响的时候禁止收拾书包
You can't pack your school bag when you hear the fire bell