动词短语
中文翻译：保持警惕
同义词：
['be on the lookout', 'keep an eye out']
例句：
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1. We need to keep a sharp lookout for any suspicious activity in the area.
我们需要密切注意该地区的任何可疑活动。
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2. The policeare keeping a sharp lookout for anyonewho might be involved in the crime.
警方正在密切注意可能涉及这起犯罪的人。
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3.It's important to keep a sharplookout for potential dangers and takenecessary precautions.
保持警惕，注意潜在的危险并采取必要的预防措施是很重要的。