normal potential function

例句：

1. 1. The normal temperature range for this region is between 20 and 25 degrees Celsius.
   该地区的正常温度范围是20到25摄氏度。
2. 2. The normal response to a sudden drop in temperature is an increase in heart rate.
   突然降低温度的正常反应是心率增加。
3. 3. The normal course of the disease is characterized by fever and fatigue.
   这种疾病的常规病程特点是发热和疲劳。