Problem: What are the most important words?
cherry blossom under blue sky at the springtime in sunny day
Answer: blossom, day, sky

Problem: What are the most important words?
A man in a black shirt leave the room and turns before leaving.
Answer: leave, room, turn

Problem: What are the most important words?
Several customers are observing a vendor weighing the produce they are buying.
Answer:
buy, observe, produce, vendor, weigh