动词短语
中文翻译：保持
同义词：
['maintain', 'control', 'keep', 'preserve']
例句：
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1.The team needs to keep its performance up to standard.
团队需要保持其表现达到标准。
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2.The firefighters kept the building from burning down.
消防员们保持了大楼不燃烧。
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3.The doctor advised us to keep our blood pressure under control.
医生建议我们控制血压。