main air pipe

例句：

1. 1.The main air pipe is responsible for distributing air throughout the building.
   主空气管负责在整个建筑中分配空气。
2. 2.Main air pipes are often used to connect different rooms in a house.
   主空气管通常用于连接房屋的不同房间。
3. 3. Main air pipes should be regularly inspected and maintained to ensure proper functioning.
   主空气管应定期检查和维护，以确保正常工作。