动词
中文翻译：保持
同义词：
['maintain', 'preserve', 'sustain']
例句：
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1. We need to keep the fire burning to cook dinner.
我们需要保持火势燃烧以便做饭。
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2. The old house needs to be kept in good condition.
这所老房子需要保持良好状态。
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3. The company will keep its promise and invest in new technology.
该公司将兑现承诺，投资新技术。