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. He is a man whois always alert to danger.
他是一个总是警惕危险的男子。
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3. The driver was watching out forany cars that might be following him.
司机在警惕任何可能跟踪他的车辆。