vowel system

3, Retroflex final shape after high-frequency use, the main vowel will gradually change over a long period of adjustment instead, the complex more retroflex final summary, the gradual reduction in the number of rhyme categories system gradually simplified.

儿化韵形成之后，在高频率的使用中，主要元音会渐渐变化，经过长期的调整归并，儿化韵由繁趋简，数目逐渐减少，韵类系统逐渐简化。

Standard Chinese pronunciation was abandoned after the use of the Pinyin system. To mark ( a consonant) with a vowel point.

国音符号在汉语拼音通行后被停用。加元音符号用元音符来标记（一个辅音）

Some Characteristics of the Vowel System for Chinese Character Pronunciation in the Korean Language

韩国汉字音韵母系统的几个特征关于锡伯语口语单元音系统

Each language has a different vowel system.

每种语言都有不同的元音系统。