最終更新日：2024/08/02
Diphthongation is the process of turning a monophthong into a diphthong.
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Diphthongation is the process of turning a monophthong into a diphthong.
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Diphthongation is the process of turning a monophthong into a diphthong.
Diphthongation is the process of turning a monophthong into a diphthong.
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