They are triggered by thunderstorms and are created when lightning from thunderstorms excites the electric field in the atmosphere above the storm.
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.
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。
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