试题题干
Fill in each of the following blanks with a word or an expression.
According to the state of the velum, vowels can be divided into two kinds: oral vowels and 
vowels.
参考答案
试题解析
根据元音的状态，元音可分为两种：口元音和鼻元音。
Fill in each of the following blanks with a word or an expression.
According to the state of the velum, vowels can be divided into two kinds: oral vowels and vowels.
根据元音的状态，元音可分为两种：口元音和鼻元音。