ventilating pipe

例句：

1. 1. The new air-conditioning system greatly improves the indoorair quality.
   新的空调系统极大地改善了室内空气质量。
2. 2. The building has excellent ventilationto ensure good air circulation.
   这座建筑有很好的通风，以确保良好的空气流通。
3. 3. The ventilation system is designed to remove harmful pollutants from the air.
   通风系统设计用来从空气中去除有害污染物。