Input: Identify the most salient words:

aircraft in flight during its maiden test at the airport

Output: aircraft
airport
flight

Input: Identify the most salient words:

a poster outside concert performance venue advertises the championship boxing match between professional boxers .

Output: advertise
boxer
poster

Input: Identify the most salient words:

As music plays, a parachute floats down into a cave from an opening in the top.

Output: float
music
parachute

Input: Identify the most salient words:

the original gate to the city built centuries before builder was born .

Output:
build
century
city