换气扇

例句：

1. 1.This air conditioner is very efficient in cooling the room.
   这台空调在冷却房间方面非常高效。
2. 2.The air quality in this area is poor due to the lack of proper ventilation.
   由于缺乏适当的通风，该地区的空气质量很差。
3. 3.The new air conditioner has improved the comfort level in our living room.
   新空调提高了我们客厅的舒适度。