Assertion: trachea's cartilage ring | /r/CapableOf | prevent the trachea
Facets:
value: from collapsing during absence of air
type: PURPOSE
Source sentences:
text: It is a membrane supported by 16-20 cartilage rings which prevent the trachea from collapsing.
text: The cartilage rings in the trachea prevent the trachea from collapsing during absence of air and also protect it.