Proper ventilation or airing of a room keeps it from being stuffy. a window opened at the top and at the bottom lets warm air escape through the top opening. Cool air enters the room through the bottom opening.

• 房间的适当通风或透气，可以使房间避免变闷。房间上、下各开一扇窗户可让热空气从上面的开口处散发出去，冷空气从下面进来。