average solar day

例句：

1. 1.The average solar day for this region is around 20 hours of sunlight.
   该地区的平均日照日约为20小时阳光。
2. 2.The average solar day varies depending on the season and location.
   平均日照日因季节和地点而异。
3. 3.The average solar day is crucial for plant growth and photosynthesis.
   平均日照日对于植物生长和光合作用至关重要。