What are the keywords in the following sentence? Pizza and salad are the meals on the trays
meal, pizza, salad, tray

What are the keywords in the following sentence? a boat passes under the raised bridge over geographical feature category
boat, bridge, pass, raise

What are the keywords in the following sentence? shot of field with a shadow of helicopter
field, shadow, shot

What are the keywords in the following sentence? flowing blue nail polish in a yellow bottle isolated on black
bottle, flow, polish