drop from the cloud
从云端坠落
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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