Assertion: scuba diver | /r/CapableOf | add air
Facets:
value: to equalize the air pressure
type: PURPOSE
value: to his middle ear
type: TRANSITIVE-OBJECT
value: via the eustachian tube
type: MANNER
Source sentences:
text: A scuba diver must add air to his middle ear via the eustachian tube to equalize the air pressure as he or she descends.