动词
中文翻译：保持
同义词：
['maintain', 'preserve', 'sustain']
例句：
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1. The old house needs to be kept in good condition.
这所老房子需要好好维护。
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2. We need to keep the secret until further notice.
我们需要在进一步通知前保密。
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3. The team kept their heads high during the tough times.
在艰难时期，队伍保持了高昂的士气。