Assertion: porpoise | /r/AtLocation | captivity
Facets:
value: sometimes
type: TEMPORAL
Source sentences:
text: Porpoises are sometimes kept in captivity and trained to perform tricks, but breeding success has been poor.
text: Porpoises are sometimes kept in captivity and trained to perform tricks, but breeding success has been poor.
text: Porpoises are intelligent creatures that can learn many tricks when they are kept in captivity.
text: Dolphins and porpoises are kept in captivity.