它们是由雷暴雨所触发出来的，当时雷暴雨所产生的闪电激发了高于暴风大气层里的电场。
They are triggered by thunderstorms and are created when lightning from thunderstorms excites the electric field in the atmosphere above the storm.
闪电在许多不同的方向长出分叉，激发了一个先导与地面连接，制造了一次闪亮的回击。
The lightning branches out in many different directions, causing one leader to make a connection with the ground, creating a bright return stroke.
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