Of or relating to the Indo-European languages or the hypothetical language from which they are derived.

 
  • ?。瓪W語(yǔ)言或由他推導出的假想語(yǔ)言的?。瓪W語(yǔ)言或由他推導出的假想語(yǔ)言的與?。瓪W語(yǔ)言或由他推導出的假想語(yǔ)言有關(guān)的
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