动词短语
中文翻译：保持警惕
同义词：
['watch closely', 'keep an eye on']
例句：
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1. We need to keep tab on the situation in the city.
我们需要密切关注城市的情况。
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2. The police kept tab on the suspects during the investigation.
警方在调查期间密切监视嫌疑人。
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3. She kept tab on her children's progress at school.
她密切关注孩子们在学校的进步。