[mu3 yu3] /native language/mother tongue/(linguistics) parent language/
  [mu3 yu3] /Muttersprache (u.E.) (S, Sprachw)/
  [mu3 yu3] /langue maternelle/langue natale/
 [ぼご] /(n) (1) mother tongue/native language/(2) {ling} (See ・そご) protolanguage/parent language/EntL1515030X/
Visszatérés a(z) „母語” laphoz.