当一个薄膜变得太薄时，弥散的电荷云发生交叠并相互排斥，就好象电子云交叠时两个中性原子的行为一样。

If the film gets too thin, the diffuse charge clouds overlap and repel, just as two neutral atoms do when their electron clouds interact.

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然后上升气流将轻盈的、带正电荷的冰晶带到云的顶部。

Then updraft wind currents carry the light, positively charged ice crystals up to the top of the cloud.

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在20世纪60年代早期，研究人员试图将火箭尾部的电线发射到雷云中，以便于为这些雷云产生的巨大电荷建立一个简单的放电路径。

In the early 1960s, researchers tried firing rockets trailing wires into thunderclouds to set up an easy discharge path for the huge electric charges that these clouds generate.

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