Please come up with a sign for the classroom that means "no loud noises".

General version:

1. Don’t make noise, keep quiet!

2. Making noise in a low voice is beneficial to others and oneself.

3. Silence creates harmonious beauty

4. Whispering softly allows us all to hear each other’s voices clearly!

5. Be polite and polite and don’t make noises

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

7. Your soft words show respect to everyone!

Campus version:

1. Let us cheer loudly for the future. Now, let us calm down and read.

2. In class, be louder; after class, be quieter.

Humor version:

1. Do you hope others can hear you clearly? Please speak softly too!

2. As long as the water is not deep, if there is a dragon, it will be spiritual; if the sound is not high, if there is sound, it will move.

3. The chairman said, those who make noise are not good comrades!

4. The flowing water is ruthless and the lover is sentimental. I advise you to please leave the building quiet