Assertion: black swan | /r/HasProperty | seen by european
Facets:
value: in 1697
type: TEMPORAL
Source sentences:
text: Black swans were first seen by Europeans in 1697, when Willem de Vlamingh's expedition explored the Swan River, Western Australia.
text: Black swans were first seen by Europeans in 1697, when Willem de Vlamingh's expedition explored the Swan River, Western Australia.