Input: Identify the most salient words:

tourists visit a botanical garden on foot and in a boat

Output: garden
tourist
visit

Input: Identify the most salient words:

A man is draining old oil out of a vehicle as part of an oil changing process.

Output: drain
oil
process
vehicle

Input: Identify the most salient words:

various seafood on sale in a market

Output: market
sale
seafood

Input: Identify the most salient words:

continent from orbit in space just as the sun rises .

Output:
continent
rise
space
sun