动词
中文翻译：保持
同义词：
['maintain', 'preserve', 'sustain']
例句：
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1. The team needs to keep their focus on the task at hand.
团队需要专注于当前的任务。
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2. She kept her promise and visited the museum yesterday.
她兑现了承诺，昨天参观了博物馆。
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3.They kept a close eye on the weather forecast before making their decision.
在做出决定之前，他们密切关注了天气预报。