单词：return air
return air的用法和样例：
例句
- For a typical single duct air system there will be one zone supply air path and one zone return air path.对于典型的单管空调系统，一般由一条区域送风路径和一条区域回风路径组成。
- Building humidification may not be required if return air contains sufficient humidity to satisfy winter requirement.如果回风含有足够的湿度来满足冬季需求的话，建筑则不需要加湿。
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