名词
中文翻译：需要保持
同义词：
['requirement', 'demand', 'necessity']
例句：
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1. We need to keep the room clean for the guests' comfort.
我们需要保持房间干净，以便客人舒适。
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2. The company needs retention of its employees to maintain productivity.
公司需要留住员工以维持生产力。
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3. The government needs to retain its citizens for a stable society.
政府需要留住公民以维护社会稳定。