Assertion: kangaroo | /r/HasProperty | a staple source of protein
Facets:
value: historically
type: TEMPORAL
value: for indigenous australians
type: TRANSITIVE-OBJECT
Source sentences:
text: The kangaroo has been historically a staple source of protein for indigenous Australians.
text: Historically, kangaroo has long been a staple source of protein due to being high in protein and low in fat (about two percent).