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  1. Front vowel - Wikipedia

  2. What Is a Front Vowel? (with pictures) - Language Humanities

  3. Pronouncing Vowels 1: Introductions front and central vowels

  4. 大概是最全的音标总结--元音部分 - 知乎 - 知乎专栏

  5. Front vowel | linguistics | Britannica

  6. 前元音 - 维基百科,自由的百科全书

  7. 1 Chapter 1 – Vowel Sounds - University of Kansas

  8. Pronunciation of English Vowel Sounds - Front Vowels, Part 1

  9. Sound more natural in English: Learn and practice 5 FRONT VOWELS