Lightning is a brilliant flash of light produced by an electrical discharge from a storm cloud.

闪电是一种因为暴风云放电而产生的一种明亮闪光。

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Using high-speed photography, scientists have determined that there are two steps to the occurrence of lightning from a cloud to the ground.

利用高速摄影技术，科学家们已经确定了闪电从云层到达地面有两个步骤。

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Then a strong current of electrons follows that path from the cloud to the ground, and it is that current that illuminates the channel as the lightning we see.

然后一股强大的电子电流沿着这条路径，从云层到达地面，正是这种电流像我们看到的闪电一样照亮了通道。

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When the cloud's maximum altitude was less than 5km (3 miles), ATDnet detected no lightning from it.

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Highton explained that the cloud columns we were seeing can reach 8 to 10km high and are classic formations associated with lightning.

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