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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本文用主分量分析法建立了雷云等强对流天气的综合判别式。

This paper presents a comprehensive recognition formula of hailstorm cloud by using principal component analysis.

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他们之所以如此，可能是因为层层雷云产生了强烈的电磁场，空气也稍带正电荷。

They may be reacting to the fact that the air can become slightly positively charged when large thunderclouds are generating the intense eletrical fields .

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