...们使出了浑身解数来抵挡冰雹——中世纪的欧洲人们敲响教堂的钟或是发射大炮，到20世纪，迷信家尝试停止云种散播（cloud seeding），但是这些办法似乎都不起作用。
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显然，飞机穿过云层与“云种散播效应”类似，在空中形成的冰晶会导致降雨。
Apparently the effects of jet planes punching through clouds are similar to "cloud seeding" operations, where ice crystals are created in the atmosphere to make it rain.
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。
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.
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