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Front vowel - Wikipedia
What Is a Front Vowel? (with pictures) - Language Humanities
Pronouncing Vowels 1: Introductions front and central vowels
大概是最全的音标总结--元音部分 - 知乎 - 知乎专栏
Front vowel | linguistics | Britannica
前元音 - 维基百科,自由的百科全书
1 Chapter 1 – Vowel Sounds - University of Kansas
Pronunciation of English Vowel Sounds - Front Vowels, Part 1
Sound more natural in English: Learn and practice 5 FRONT VOWELS