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北方方言在宋元之间中古浊音声母清化以后,在零声母字的基础上增生了浊声母和次浊声母,这些声母的增生一方面对音系有一定的稳固作用,另一方面则造成今天北方方言的语音差别。很多官话方言都有[v][z][γ][η]等声母,而这些声母都是在中古音清化以后,从清声母的基础上再发展而来的。现代官话有超过三分之二的方言点有这个现象。不增生的方言点反而是少数。
Northern dialect in the Song and Yuan Dynasties after the middle voiced initials were cleared, the zero initials on the basis of the proliferation of voiced initials and sub-voiced initials, the initials of these initials on the one hand, the sound system has a certain role in stabilizing, on the other hand is causing the North today Dialect differences in pronunciation. Many official dialects have initials such as [v] [z] [γ] [η], and these initials have been developed from the initial consonants after their elimination. More than two-thirds of modern dialects have this phenomenon. Instead of increasing the dialect dialect is a minority.