Vowel table: There are 24 vowels.

Monovowels: a, o, e, I, u, u. Compound vowels: ai, ei, ui, ao, ou, iu, ie, ve special vowels: er nasal vowels: an, en, in, un, vn, (pre-nasal vowel), ang, eng, ing, ong (post-nasal vowel).

Initial list:

Answer: Pronunciation method: When pronouncing, the lips are naturally wide, the tongue is flat, the middle part of the tongue is slightly raised, and the vocal cords vibrate. O: Pronunciation method: When pronouncing, the lips are round, slightly warped, the tongue is backward, the tongue surface is backward, the tongue is centered, and the vocal cords vibrate. E: Pronunciation method: When pronouncing, the mouth is half-open, the tongue is backward, the corners of the mouth are flat to both sides, and the vocal cords vibrate.

Overall recognition syllable:

One: Pronunciation method: When pronouncing, the mouth is slightly flat, the tip of the tongue presses down the gums, the tongue surface is raised, and it clings to the upper hard palate, and the vocal cords vibrate. U: Pronunciation method: When pronouncing, the lips are round, protruding into small holes, the back of the tongue is raised, and the vocal cords vibrate. ü: Pronunciation method: When pronouncing, the lips are round and closed, the tip of the tongue is close to the lower gum, the front of the tongue protrudes, and the vocal cords vibrate.

Ai: pronunciation method. When pronouncing, pronounce A first, then slide to I, with uninterrupted airflow and short pronunciation.