Assertion: snail | /r/CapableOf | keep their shells
Facets:
value: for long periods
type: TEMPORAL
Source sentences:
text: These snails get the calcium they need to keep their shells strong by eating the shells of other marine animals, including other snails.
text: They can stay within the shell for long periods, if necessary.
text: They’ll stay inside their shells until food becomes more available or the weather becomes safer for them to come back out.