Assertion: vowel's formant | /r/HasAspect | higher frequency
Facets:
Source sentences:
text: Thus the first formant F 1 has a higher frequency for an open vowel (such as [a]) and a lower frequency for a close vowel (such as [i] or [u]); and the second formant F 2 has a higher frequency for a front vowel (such as [i]) and a lower frequency for a back vowel (such as [u]).