由《切韵》韵母元音长短配对转易为《韵镜》等呼的音系变化说
余迺永
由《切韵》韵母元音长短配对转易为《韵镜》等呼的音系变化说
The Vowel System of Qieyun is Five Pair Vowels and One Single Vowel
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