名词
中文翻译：循环空气
同义词：
['recirculated air', 'recirculated oxygen']
例句：
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1. Theair in the room is very staleand must be recirculated.
房间里的空气非常闷，必须循环。
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2. The recirculating system helps tomaintain a healthy indoor environment.
循环系统有助于保持室内空气健康。
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3. During the wintermonths, the recirculating air systemkeeps the house warm.
在冬季，循环空气系统使房屋保持温暖。