Of, relating to, or comprising the Indo-European languages that maintained a distinction between the reflexes of Indo-European velar k, g, gh and labiovelar kw, gw, gwh. 颚音类的保留了软颚音k、g、gh与圆唇软颚音kw，gw，gwh。之间反映形式区别的印欧语系语言的、与之相关的或由之组成的
Of,relating to,or comprising the Indo-European languages that maintained a distinction between the reflexes of Indo-European velar k,g,gh and labiovelar kw,gw,gwh. 颚音类的保留了软颚音k、g、gh与圆唇软颚音kw，gw，gwh。之间反映形式区别的印欧语系语言的、与之相关的或由之组成的。
Comparative Research on Labiovelar Initials in Atu Speech of Yi Language 彝语阿都话唇软颚复辅音声母比较研究
