动词
中文翻译：保持
同义词：
['maintain', 'preserve', 'sustain', 'hold']
例句：
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1. The team needs to keep up with the pace of the game.
队伍需要跟上比赛的节奏。
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2. The old man kept his promise to visit his grandson.
老人遵守诺言去看望孙子。
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3. Keeping a diary helps me remember important events.
写日记帮助我记住重要的事件。