Assertion: lung's wall | /r/HasAspect | shelf
Facets:
Source sentences:
text: The nasal cavities (between the nostrils and the pharynx) are quite narrow, firstly by being divided in two by the nasal septum, and secondly by lateral walls that have several longitudinal folds, or shelves, called nasal conchae, thus exposing a large area of nasal mucous membrane to the air as it is inhaled (and exhaled).