secondary air channel

例句：

1. 1.The secondary air channel is crucial for maintaining a comfortable indoor environment.
   次级空气通道对于保持室内舒适环境至关重要。
2. 2. In the design of the building, the secondary air channel plays an important role in improving thermal comfort.
   在建筑设计中，次级空气通道在提高热舒适度方面起着重要作用。
3. 3. The secondary air channel effectively reduces the concentration of pollutants in the room.
   次级空气通道有效地降低了房间内污染物的浓度。