Problem: What are the most important words?
a waterfall and stream flows under the trail which winds around the highest point
Answer: stream, trail, wind

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

Problem: What are the most important words?
colorful toy cars are offered for sale at the weekly flea market aside
Answer:
car, market, sale