Assertion: hen's bone | /r/HasProperty | hollow
Facets:
value: usually
type: DEGREE
value: with the hollow
type: OTHER
Source sentences:
text: The bones of most birds are hollow and filled with air.
text: Long bones are usually hollow with the hollow filled with bone marrow and extensions of the air sacs.
text: Birds have many bones that are hollow (pneumatized) with criss-crossing struts or trusses for structural strength.