动词短语
中文翻译：保持在
同义词：
['stay within', 'remain within', 'be confined to']
例句：
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1. The team decided to keep within budget by ordering only the essential supplies.
团队决定只订购必要的物资，以免超支。
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2. The scientist kept within his field of expertise in conducting the research.
科学家在其专业领域内进行研究。
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3. The children were kept within a safe area while their parents attended the event.
在父母参加活动期间，孩子们被限制在一个安全区域内。