Assertion: sea urchin's spine | /r/HasProperty | hollow
Facets:
value: usually
type: DEGREE
Source sentences:
text: The spines are usually hollow and cylindrical.
text: The spines are usually hollow and cylindrical.
text: The spines are thin, hollow, and break easily.
text: The spines, often black but sometimes brown-banded, are hollow and contain a mild venom.
text: Painful poke: The long, thin spines are hollow and sharp enough to painfully pierce through clothing and gloves.
text: Both the longer, primary spines (which are hollow) and the smaller, secondary spines are brittle and break off after puncturing the skin.