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1. Oxford Dictionary

   vowel shift

   • n.
     a phonetic change in a vowel or vowels.；a series of changes between medieval and modern English affecting the long vowels of the standard language.

   • noun: vowel shift, plural noun: vowel shifts

2. • 更多解釋

   vowel shift

   • IPA[ˈvou(ə)l SHift]

   • n.
     a phonetic change in a vowel or vowels.

   Oxford American Dictionary