Type A is the result of internal initial and rhyme coordination on phonetics level, while type B comes into being for phonological and systematic reasons.
B类音变是由音系结构系统性的要求引发的，属音系学层面的音变。
Type A is the result of internal initial and rhyme coordination on phonetics level, while type B comes into being for phonological and systematic reasons.
B类音变是由音系结构系统性的要求引发的，属音系学层面的音变。
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