名词
中文翻译：Unknown
同义词：
['keep', 'maintain', 'preserve', 'sustain']
例句：
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2.
动物
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3.
人
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1. The baby is sleeping soundly in its crib.
宝宝在它的小床上睡得安稳。
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2. The old man keeps a diary to remember his life.
老人坚持写日记来回忆他的一生。
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3. The team needs to keep up with the pace of the game.
队伍需要跟上比赛的节奏。