cooling degree day

例句：

1. 1. The temperature dropped significantly after the rain, requiring a cooling degree day to be addedto the forecast.
   雨后温度大幅下降，需要将冷却日数加入预报。
2. 2.The cooling degree day is calculated by subtracting the average temperature from the actual temperature during the day.
   冷却日数是通过从一天的实际温度中减去平均温度来计算的。
3. 3.The cooling degree day is an important factor in determining the optimal temperature for outdoor activities.
   冷却日数是决定户外活动最佳温度的重要因素。