Assertion: milk's calcium | /r/HasProperty | key
Facets:
value: of these
type: OTHER
value: for healthy bones
type: PURPOSE
Source sentences:
text: It’s not a news flash that calcium is key for healthy bones.
text: Of these, calcium is a key nutrient that is usually obtained from milk and milk products.
text: Calcium and vitamin D are some of the key nutrients involved in this process.