primary vowel的用法和样例：
例句
- Tone symbols are often marked on the main vowel of a syllable.
声调符号一般标注在音节中的主要元音上。
primary vowel的相关资料：
临近单词
primary map
primary
primary ventricular standstill
primary and secondary teachers
Primary physiologic amenorrhea
primary transcriptase particle
Primary acquired cold urticaria
primary mother-tree selection
primary annulo-spiral endings
Primary and secondary qualities
primary and high school teacher
primary stimulus generalization
