Input: Identify the most salient words:

teacher helping grade students working at their desks in the classroom

Output: desk
help
work

Input: Identify the most salient words:

through the trees we caught frequently glimpses rising like an island above the clouds

Output: cloud
island
tree

Input: Identify the most salient words:

A large jet sits at the gate at the airport.

Output: airport
gate
sit

Input: Identify the most salient words:

building floating shelves for the dining room

Output:
build
room
shelf