recirculated air

例句：

1. 1. The new air purifier filters out recirculated air to improve indoor air quality.
   新的空气净化器过滤掉循环空气，以提高室内空气质量。
2. 2. During the renovation, we need to ensure that the recirculated air is not contaminated with dust.
   在装修期间，我们需要确保循环空气不被灰尘污染。
3. 3. The recirculated air system helps to reduce energy consumption and save on heating costs.
   循环空气系统有助于减少能源消耗和节约取暖成本。