动词短语
中文翻译：保持警惕
同义词：
['be on the lookout for', 'bevigilant about', 'keep an eyeout for']
例句：
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1. Weneed to keep a good watch for anysuspicious activity in the area.
我们需要保持警惕，注意该地区的任何可疑活动。
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2. The police arekeeping a good watch for any criminalswho might be lurking around.
警方正在密切监视任何可能潜伏的罪犯。
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3. Shekept a good watch for her friend's safety during the storm.
她在暴风雨期间密切关注她朋友的安全。