动词短语
中文翻译：警戒
同义词：
['alert', 'caution', 'vigilant例句：1. The police are on high alert after the recent robbery.（警方在最近一起抢劫案后高度警惕。）']
例句：
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1. The police are on high alert after the recent robbery.
警方在最近一起抢劫案后高度警惕。
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2.She was cautious about her new job offer.
她对新工作offer持谨慎态度。
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3. The captain is always vigilant in his duties.
船长总是对他的职责保持警惕。