动词短语
中文翻译：警惕
同义词：
['be on the lookout', 'be vigilant', 'be wary']
例句：
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1. He was on the watch for any suspicious activity in the area.
他警惕着该地区的任何可疑活动。
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2. The police were on the watch for a potential terrorist attack.
警方警惕着潜在的恐怖袭击。
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3. She was on the watch for her friend's return home.
她警惕着她朋友回家。