Assertion: trachea's ring | /r/HasAspect | cylindrical section
Facets:
Source sentences:
text: The shape of the rings is not critical; instead of an oval or rounded sectional axial section, the rings can, for example, have a cylindrical section, be rectangular in axial section; offset or Z-shaped; and they can be thicker than the collapsible section to which or in which they are secured.
text: The shape of the rings is not critical; instead of an oval or rounded sectional axial section, the rings can, for example, have a cylindrical section, be rectangular in axial section; offset or Z-shaped; and they can be thicker than the collapsible section to which or in which they are secured.