形容词
中文翻译：警觉的
同义词：
['vigilant', 'watchful', 'wary', 'vigilant']
例句：
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1. The police are alert to any suspicious activity in the area.
警方对该地区的任何可疑活动保持警惕。
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2. She was always alert to her surroundings.
她总是对她周围的环境保持警惕。
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3. The driver was alert enough to stop at the first red light.
司机足够警觉，在第一个红灯时停下了。