柯林斯詞典diphthong /?d?fθ??, ?d?p-/ (diphthongs) 1. N-COUNT A diphthong is a vowel in which the speaker's tongue changes position while it is being pronounced, so that the vowel sounds like a combination of two other vowels. The vowel sound in "tail" is a diphthong. 雙元音 返回 diphthong劍橋詞典a vowel sound in which the tongue changes position to produce the sound of two vowels 雙元音 比較monophthong triphthong 返回 diphthong