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How to put it in a nice way that no noise is allowed and no fighting is allowed?

Don’t make noise, keep quiet.

You can also refer to the following slogans: 1. Don’t raise your voice and don’t scare others.

2. A gentleman does not behave in a low voice.

3. Heart-to-heart communication requires listening quietly!

4. Please do not raise your voice or startle the readers.

5. Come gently and go quietly.

6. Tranquility creates harmonious beauty.

7. Don’t speak loudly to scare others.