cooling degree-day

例句：

1. 1. The temperature dropped significantly during the night, requiring a cooling degree-day toaccount for the change in weather conditions.
   夜间温度显著下降，需要冷却日数来考虑天气变化。
2. 2. During the summer, thecooling degree-day is calculated by subtracting the average daily temperature from theaverage maximum temperature.
   在夏季，冷却日数是通过将平均最高温度减去平均日温来计算的。
3. 3. The cooling degree-dayis an important factor in determining the optimalplanting date for crops, as it affectsthe amount of sunlight they receive and therate of photosynthesis.
   冷却日数是确定作物最佳种植日期的重要因素，因为它影响作物接收到的阳光量和光合作用速率。