Assertion: feather's bird | /r/HasAspect | efficient respiratory system
Facets:
value: unusually
type: DEGREE
value: to flap
type: PURPOSE
Source sentences:
text: For instance, a bird has light, hollow bones as well as an unusually efficient respiratory system and specialized muscles to flap and control its wings.
text: For instance, a bird has light, hollow bones as well as an unusually efficient respiratory system and specialized muscles to flap and control its wings.