动词
中文翻译：保持
同义词：
['maintain', 'preserve', 'sustain']
例句：
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1. The old house is kept in good condition by the local authorities.
当地政府保持这座老房子的良好状态。
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2. We need to keep our promises to maintain a good relationship with our clients.
我们需要遵守承诺，以维护与客户的良好关系。
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3. The team worked hard to keep their performance at an excellent level.
团队努力工作，保持其表现处于优秀水平。