... warn nb of sth 警告某人某事 warn someone of 警告 warn them of possible dangers 警告他们可能有危险 ...
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warn someone of
警告某人
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Someone must warn him of the difficulties.
必须有人提醒他有这些困难。
youdao
For example, if Jia Jia detects that someone is taking a photo of her, she'll warn the photographer to stand back or else the picture will make her face "look fat."
比如，如果佳佳发现有人在给她拍照片，她会警告，站远点儿，否则会把她拍胖。
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