形容词
中文翻译：警惕的
同义词：
['alert', 'vigilant', 'watchful']
例句：
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1. The police are always on the lookout for any suspicious activity.
警方总是警惕任何可疑活动。
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2. 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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3. She is a watchful person who never forgets her responsibilities.
她是一个谨慎的人，从不忘记自己的责任。