This electrical potential creates a powerful electric field, a bit like the contour lines on a map, which stretchesfrom the bottom of the cloud to the ground (Earth).

• 这些电压（势差）产生强大的电场（有些像地图上的等高线），从云层的底端向地面（地球）延伸，结果导致地面变为正电势（正电子受到云层负电子的排斥）。