Assertion: blue whale | /r/HasProperty | difficult to weigh
Facets:
value: because of their size
type: CAUSE
Source sentences:
text: Blue whales are difficult to weigh because of their size.
text: Blue whales are difficult to weigh because of their size.
text: Blue whales are difficult to weigh because of their size.
text: Blue whales are difficult to weigh because of their size.