名词
中文翻译：直接空气循环
同义词：
['Direct Air Circulation', 'Direct Air Flow', 'Direct Air Movement']
例句：
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1. The direct air cycle system is designed to improve indoor air quality.
直接空气循环系统旨在改善室内空气质量。
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2.The company's new product uses a direct air cycle technology.
该公司的新产品采用了一种直接空气循环技术。
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3. During the winter, the direct air cycle helps to keep the house warm.
在冬天，直接空气循环有助于保持房屋温暖。