形容词
中文翻译：警觉的
同义词：
['vigilant', 'watchful', 'wary']
例句：
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1. The driver was alert to the dangers of driving at night.
司机对夜间驾驶的危险保持警觉。
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2. She is always alert to her surroundings.
她总是对周围环境保持警觉。
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3. The police were alert for any suspicious activity in the area.
警方对该地区的任何可疑活动保持警惕。