ground-to-cloud discharge

例句：

1. 1. This is the first time we have observed ground-to-cloud discharge in this region.
   这是我们第一次在这个地区观察到地面到云的放电。
2. 2. The study of ground-to-cloud discharge has significant implications for understanding the Earth's climate system.
   对地面到云放电的研究对于理解地球气候系统具有重要意义。
3. 3. The researchers found that ground-to-cloud discharge plays a crucial role in the formation of clouds.
   研究人员发现，地面到云的放电在云的形成过程中起着至关重要的作用。