Input: Identify the most salient words:

Waiting for the parade to pass by.

Output: parade
pass
wait

Input: Identify the most salient words:

container ship being refuelled while unloading in the port

Output: refuel
ship
unload

Input: Identify the most salient words:

on the grass near the tree stacked firewood

Output: firewood
stack
tree

Input: Identify the most salient words:

View from gate of jet connected to jet way for passengers to board or deplane

Output:
board
connect
gate
jet