Two years later, in 1925, Urysohn proved his classical theorem that every regular space with a countable base is metrizable.
1925年，Urysohn证明了一个经典结论：每一正则具有可数基的空间是可度量化的。
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This paper gives the metrizable conditions of 2-probabilistic metric space (2-pm space), its distance function and pseudo distance function, thus extends some conclusions of PM-space to 2-pm space.
本文给出了2—PM空间的可度量化条件及度量函数、伪度量函数，从而把PM空间上的有关结论推广到2—PM空间上。
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