Englishfor English speakers
noise
Noun
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A noise is a sound, usually one that you don't want.
There's too much noise. I can't hear what she's saying.
envelope
Noun
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An envelope is a paper cover that you put a letter in to send it.
She put the letter into the envelope, addressed it to Charles, and put a stamp on it.
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An envelope is a covering that goes all the way around something.
Each virus has a special envelope of protein surrounding it.