Assertion: cat | /r/CapableOf | produce the purring noise
Facets:
value: by using the vocal folds
type: MANNER
Source sentences:
text: One hypothesis, supported by electromyographic studies, is that cats produce the purring noise by using the vocal folds and/or the muscles of the larynx to alternately dilate and constrict the glottis rapidly, causing air vibrations during inhalation and exhalation.