Assertion: heavy water | /r/HasProperty | the key
Facets:
value: to one type of reactor
type: TRANSITIVE-OBJECT
Source sentences:
text: Heavy water is the key to one type of reactor in which plutonium can be bred from natural uranium.
text: Heavy Water is the common name for D2O, deuterium oxide, and is one of the key materials used in a CANDU reacor.