Input: Identify the most salient words:

A boy jumping on a skateboard on concrete.

Output: concrete
jump
skateboard

Input: Identify the most salient words:

a plane flying by close to the ground

Output: fly
ground
plane

Input: Identify the most salient words:

A worker operates machinery on a cold day.

Output: day
machinery
operate

Input: Identify the most salient words:

models walk the ramp during fashion week

Output:
model
ramp
walk
week