动词
中文翻译：使警觉
同义词：
['warn', 'notify', 'caution']
例句：
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1. The police are alert to any suspicious activity in the area.
警方对该地区任何可疑活动保持警惕。
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2. She is always alert to her surroundings when she travels abroad.
她出国旅行时总是对周围环境保持警惕。
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3. The doctor advised us to be alert for any signs of infection.
医生建议我们注意任何感染的迹象。