Assertion: polonium's use | /r/HasProperty | possible
Facets:
Source sentences:
text: Polonium had been studied for possible use in heating spacecraft.
text: Polonium had been studied for possible use in heating spacecraft
text: Polonium has been studied for possible use in heating spacecraft.
text: Polonium has been studied for possible use in heating spacecraft.
text: Polonium has been studied for possible use in heating spacecraft.
text: Polonium has been studied for possible use in heating spacecraft.
text: Polonium has been studied for possible use in heating spacecraft.
text: Polonium has been studied for possible use in heating spacecraft.