最終更新日：2024/07/31
Diphthongization is the process of changing a monophthong into a diphthong.
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Diphthongization is the process of changing a monophthong into a diphthong.
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Diphthongization is the process of changing a monophthong into a diphthong.
Diphthongization is the process of changing a monophthong into a diphthong.
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