Input: Identify the most salient words:

boats go under a railway bridge on the canal

Output: boat
bridge
canal

Input: Identify the most salient words:

Pair of cross country skiers on well traveled snow field near buildings.

Output: field
pair
travel

Input: Identify the most salient words:

athlete looks relaxed before stage .

Output: athlete
look
relax

Input: Identify the most salient words:

aircraft model can fly like an airplane and land like a helicopter .

Output:
airplane
fly
helicopter