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Diphthong: Explanation and Examples - Grammar Monster
English diphthongs list: Examples, pronunciation, and tips - Preply
Vowel Diphthongs Word Lists - Making English Fun
Diphthong Vowel Sounds - The Sound of English
Diphthong - Wikipedia
双元音 - 维基百科,自由的百科全书
What is a Diphthong? (Definition, Examples, Word List)
Diphthong Definition and Examples in English - ThoughtCo
The Guide to English Vowel Sounds - Pronunciation with Emma
Diphthongs: The Sliding Vowels - ThoughtCo