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No one told me she was ill.
没人告诉我她病了。
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I'd like to go to the concert but no one else (= no other person) wants to.
我想去听音乐会,但其他人都不愿意去。
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"Who was that on the phone?" "No one you would know."
“谁来的电话?”“你不认识的人。”
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At first I thought there was no one in the room.
起初我以为房间里没人。