A complex speech sound or glide that begins with one vowel and gradually changes to another vowel within the same syllable, as(oi) in boil or(? in fine.

  • 双元音一个滑移的单音节言语项,它在一个元音的发音位置上或其附近开始,并向另一个元音的发音位置移动。如在boil中的(oi)或在fine中的(i)
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