通风管道Air vent duct
通风管道是为了使空气流通，降低有害气体浓度的一种基础设施。
Ventilation pipes are an infrastructure for air circulation and for reducing the concentration of harmful gases.
通风管道是为了使空气流通，降低有害气体浓度的一种基础设施。
Ventilation pipes are an infrastructure for air circulation and for reducing the concentration of harmful gases.