Assertion: ostrich's wing | /r/HasProperty | useful
Facets:
value: very
type: DEGREE
value: for providing lift
type: PURPOSE
Source sentences:
text: These spanned wings are also useful when ostrich turns to the left or right at high speed.
text: Wings are very useful for providing lift (this gets them off the ground).
text: The wings of an ostrich are useful, but that doesn't mean that they tell us nothing about evolution.