相对湿度

例句：

1. 1. The room is too dry, which affects the relative humidity.
   房间太干燥了，这影响了相对湿度。
2. 2. The farmer adjusted the irrigation system to maintain a relative humidity of 70%.
   农民调整灌溉系统，以保持相对湿度为70%。
3. 3. The air conditioner controls the relative humidity in the room.
   空调控制着房间里的相对湿度。