Assertion: beetle's pair | /r/ObjectUse | used for flying
Facets:
Source sentences:
text: Beetles have two pairs of wings, the front pair, called "elytra", are hard, thick sheath or shell-like and protect the more normal rear pair of wings which are used for flying.
text: These insects are characterized by a pair of special hardened forewings that serve as a protective covering for a second pair of wings used for flying.
text: Only the second pair of wings (which are large and membranous) are actually used for flying.