For the teaching video of vowel ao ou iu, please refer to this video link:

It takes longer and louder to pronounce ao than to pronounce a alone, and then the tongue will gradually rise, and the mouth will close, curl and make a sound.

A sound like u should be light and short. When sending ou, send first. Then the lips gradually gather and make a u sound, which reads long and loud.

The pronunciation of u is light and vague.

Iu is a combination of I and ou. When I pronounce iu, I pronounce it first, and then the sound gradually turns to U, which is a little more open than the single vowel U.

The lower the bit, the greater the loudness ratio of u.

The scheme of Chinese Pinyin can be traced back to 1906 Zhu's Jiangsu Xinxin and 1908 Liu Mengyang's China Phonetic Alphabet.

Word book, and 1926 mandarin Roman characters and 193 1 Latin Chinese characters. The Latin scheme of all these Chinese characters

The formulation of Chinese Pinyin provides the basis.

Hanyu Pinyin is a Latin scheme of Chinese characters in China, which was adopted by the China Chinese Character Reform Commission in the character reform from 1955 to 1957.

The Pinyin Scheme Committee studied and formulated.

This pinyin scheme is mainly used to mark the pronunciation of Putonghua and Chinese as the phonetic symbol of Chinese characters. 1982, becoming an international

Standard ISO7098 (Chinese Roman alphabet spelling). At present, most overseas Chinese areas, such as Singapore, use information technology in Chinese teaching.

Chinese Pinyin.

The rules for the location of marked tones in Chinese Pinyin are as follows:

If there are two vowels (vowels), and the first vowel (vowel) is I, U or U, mark the tone on the second vowel.

(vowel) In other cases, the tone should be marked above the first vowel (vowel).