When you pronounce ei, you pronounce E first, and then slide to I. When you pronounce E, your tongue position is higher than that of single E, and your pronunciation is louder.

When sending ai, send A first, and this A is in front of the tongue than when sending A alone. After A, the tongue is slowly lifted, the mouth is slowly closed, and it stops when it reaches the tongue position of I, and there is a sliding process from A to I.

When sending ui, send U first, then send ei, and the mouth shape changes from round to flat. Ui itself cannot be a syllable, it must be spelled with the first letter to become a syllable. Ai and ei can be their own syllables and directly pinyin Chinese characters.

Hanyu Pinyin (Hanyu Pinyin) is the Latin scheme of Hanyu Pinyin in People's Republic of China (PRC), which was studied and formulated by the Hanyu Pinyin Scheme Committee of the former China Language Reform Committee (now the State Language Commission) during the period from 1955 to 1957. This pinyin scheme is mainly used to mark the pronunciation of Putonghua and Chinese as the phonetic symbol of Chinese characters. 20 12 10 1, the new Chinese phonetic orthography rules will be formally implemented.