diphthong
noun [ C ] phonetics specialized uk/ˈdɪf.θɒŋ/ /ˈdɪp.θɒŋ/ us/ˈdɪf.θɑːŋ/ /ˈdɪp.θɑːŋ/
双元音
a vowel sound in which the tongue changes position to produce the sound of two vowels
Compare: monophthongtriphthong
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