Problem: What are the most important words?
Boat that just crossed under a bridge on the waterway of a city.
Answer: bridge, city, cross, waterway

Problem: What are the most important words?
little girl standing in the classroom with a text of i am still learning on the blackboard .
Answer: blackboard, learn, text

Problem: What are the most important words?
hundreds of fans watched the action on the big screen .
Answer:
action, screen, watch