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。
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.
第一类别为时的博览会最多6个月，并且在一个极大的区域也许被拿着。
Expositions of the first category last a maximum of 6 months and may be held on an enormous area.
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