动词短语
中文翻译：警告
同义词：
['prevent', 'caution', 'advise']
例句：
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1.We should warn against the dangers of smoking.
我们应该警告人们吸烟的危险。
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2. The doctor warned us against drinking too much alcohol.
医生告诫我们不要喝太多酒。
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3. He warned against the possibility of a storm approaching.
他警告我们暴风雨即将来临的可能性。