Storm clouds drop as little as 10 percent of their water as rain or snow, but "cloud seeding" has been used since the 1950s to coax more from them.

暴风云只降下10%水分成为雨或雪，而自1950年代起采用的“云种散播”，可催化降下更多水分。

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Sometimes we can prevent a cloud from producing rain.

有时我们可以阻止云产生雨。

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Rain drops from the cloud.

云层中落下雨滴。

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From a cloud, of course, the obvious route back to earth is via rain.

ECONOMIST: Aerobiology