动词短语
中文翻译：保持警惕
同义词：
['be on the lookout', 'be vigilant', 'be alert例句：1. We need to keepa close eye on the situation.（我们需要密切关注情况。）']
例句：
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1. We need to keepa close eye on the situation.
我们需要密切关注情况。
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2. The police kept a sharp lookoutfor any suspicious activity.
警方对任何可疑活动保持高度警惕。
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3. She was keeping aclose watch on her children's safety.
她密切监视着孩子们的安全。