primary vowel的用法和樣例：
例句
- Tone symbols are often marked on the main vowel of a syllable.
聲調符號一般標註在音節中的主要母音上。
primary vowel的相關資料：
臨近單詞
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
