Assertion: beetle's forewing | /r/HasProperty | hard
Facets:
Source sentences:
text: Beetles are generally characterized by a particularly hard exoskeleton and hard forewings (elytra) not usable for flying.
text: Beetles usually have a hard exoskeleton and hard forewings (elytra) that cover the back part of their body and shield the second wings (alae).
text: Forewings, called elytra, are hard and well polished (they protect scarab beetle from predators).