Assertion: emperor penguin | /r/HasProperty | bred since the 1980s
Facets:
value: successfully
type: MANNER
Source sentences:
text: Emperor penguins have been kept in captivity since the 1930s, but only successfully bred since the 1980s.
text: Emperor penguins have been kept in captivity since the 1930s, but only successfully bred since the 1980s.