Assertion: helicopter | /r/CapableOf | fly at mars
Facets:
value: for decades
type: TEMPORAL
Source sentences:
text: But before the helicopter can fly at Mars it has to get there.
text: NASA actually has been working on developing a helicopter that could fly on Mars for decades now, as Bob Balaram, the project's chief engineer at NASA's Jet Propulsion Laboratory near Pasadena, California, explains via email.