Assertion: ufo | /r/HasProperty | unexplained occurrences
Facets:
value: in their reading of the phenomenon
type: OTHER
Source sentences:
text: In their reading of the phenomenon, UFOs were unexplained occurrences that merited conscientious study.
text: A UFO, unidentified flying object, is an unexplained moving object observed in the sky, especially one assumed by some observers to be of extra-terrestrial origin (Random House Dictionary).