Problem: What are the most important words?
fluffy clouds quickly moving on the sky over dry grass in desert
Answer: cloud, grass, move, sky

Problem: What are the most important words?
shepherd leads his flock near the remarkable temples of a city .
Answer: flock, shepherd, temple

Problem: What are the most important words?
Two parking meters on the curb, one with some time remaining.
Answer:
curb, meter, remain