Assertion: valve | /r/HasProperty | flat
Facets:
value: usually
type: DEGREE
value: with a long rod
type: OTHER
value: in oysters
type: LOCATION
value: almost
type: DEGREE
Source sentences:
text: In oysters the lower valve may be almost flat while the upper valve develops layer upon layer of thin horny material reinforced with calcium carbonate.
text: The valve is usually a flat disk of metal with a long rod known as the "valve stem" attached to one side.