return airflow

例句：

1. 1. The airflow in the room is very strong.
   房间里的气流非常强。
2. 2.The return airflow from the vents helps to cool down the room.
   从通风口返回的气流有助于冷却房间。
3. 3.During the winter, the airflow patterns can change significantly.
   在冬天，空气流动模式可以显著变化。