动词
中文翻译：Unknown
同义词：
['sustain', 'preserve', 'sustain', 'keep', 'maintain']
例句：
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1. The team needsto maintain a high level of performance throughout the season.
整个赛季，该团队需要保持高水平的表现。
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2. The company has invested heavily in research and development to maintain its competitive edge.
公司大量投资于研究和开发，以保持其竞争优势。
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3. To maintain a healthy diet, it's important to eat a balanced mix of fruits and vegetables.
为了保持健康的饮食，重要的是要吃水果和蔬菜的平衡混合。