polyphthong英语原文释义、词形变化、词源和词汇关系

英文释义

名词 n.

A phoneme that begins with the sound of one vowel or semivowel and transitions through one or more other (semi)vowel sounds.

— The teacher who uses Pinyin without knowing about such things as the place of the tone symbol in the case of polyphthong finals is merely incompetent but the teacher who supports the student in developing false notions about the language norm by adopting a systematically casual attitude to its technical aspects, can cause much greater harm.
A diaphoneme realized as a multitarget vowel in some but not necessarily all dialects.

polyphthongs plural