意译：Be quiet in Library.
直译：
In the library, we can not shout loudly
We can't talk loudly in the library.
建议用：
Kepp quiet in Library.
你原句可用：
In library, we can't shout aloud.
We are not allowed to shout in the library.
No ruckus is allowed in the library.
Shouting is strictly prohibited in the library.
No screaming is allowed in the library.
【英语牛人团】
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