Input: Identify the most salient words:

vehicular and railroad bridge leading through the calm lake .

Output: bridge
lake
lead

Input: Identify the most salient words:

portrait of a young smiling teacher in classroom .

Output: classroom
portrait
smile
teacher

Input: Identify the most salient words:

visitors exploring the cobbled streets of a city

Output: city
cobble
street

Input: Identify the most salient words:

the number of electrons in an atom is

Output:
atom
electron
number