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 a close eye on the game score.
队伍需要密切关注比赛得分。
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2. She kept her promise and arrived on time.
她遵守了承诺，准时到达。
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3. We need to keep our eyes open for any potential problems.
我们需要警惕任何潜在的问题。