hair hygrograph

例句：

1. 1. The hair hygrograph is used to measure the humidity in a room.
   毛发湿度计用于测量房间的湿度。
2. 2.The hair hygrograph was an essential tool for farmers during the rainy season.
   毛发湿度计是农民在雨季必备的工具。
3. 3.The hair hygrograph helped me understand the importance of maintaining proper humidity levels in my home.
   毛发湿度计让我明白了保持家中适宜湿度的重要性。