Not all water vapour in the atmosphere turns to precipitation, and for the snow to fall, water vapour should concentrate on ice crystals first.
寻找适合进行人工干预的气象条件,然后喷洒化学药品,大约需要出动8至10架飞机。 大气中并非所有的水蒸汽都能转化为降雨,至于降雪,水蒸汽首先应该形成冰晶。
By using the weak maximum principle, the uniqueness and stability of the solution of water vapour equation with the first, second and third boundary-value problems were proven.
利用该弱极大值原理,证明了对于第一类、第二类和第三类边值问题,水汽方程解的唯一性和稳定性。
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