Input: Identify the most salient words:

mass transportation system carried passengers virtually the same number as the year before .

Output: carry
passenger
system

Input: Identify the most salient words:

love this idea for lights within the wooden wall panels .

Output: idea
light
love

Input: Identify the most salient words:

A man operates a scientific microscope, adjusting the focus as he describes his actions.

Output: describe
microscope
operate

Input: Identify the most salient words:

governor visited the classroom of students who are

Output:
classroom
student
visit