There are 39 vowels in Mandarin, of which 23 are vowels, and 16 is a vowel with nasal consonants. According to the structural characteristics of vowels, vowels are generally divided into three categories, namely monosyllabic vowels, complex vowels and nasal vowels.
It is a short poem with folk song flavor, which is mainly accepted by children. It is one of the oldest and most basic genres of children's literature.