You mustn't park your school bag when you hear the fire bell.保持原意怎么改?

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Youmustn''tparkyourschoolbagwhenyouhearthefirebell.保持原意怎么改?Youmustn''tparkyourschoolbagwhenyouhearthef

You mustn't park your school bag when you hear the fire bell.保持原意怎么改?
You mustn't park your school bag when you hear the fire bell.保持原意怎么改?

You mustn't park your school bag when you hear the fire bell.保持原意怎么改?
It is not allow for you to park your school bag when you hear the fire bell