The schwa vowel is omitted in syllables that contain vocalic r, l, m or n.央元音在含有元音性（辅音）r, l, m或者n的音节中会被省略。
These vowels play an important role in the vocalic systems of Slavic languages. 这些元音在斯拉夫语言的元音体系中有很重要的作用。
Compare: consonantal
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At this stage infants are capable of transmitting contrasts of vocalic quality.
Research on vocalic variation in Scottish English has shown that variation tends to occur according to the age, gender, and socioeconomic class of the speaker.
Features that were observed included pitch changes and vocalic lengthening.