What are the keywords in the following sentence? coin with the image of an eagle
coin, eagle, image

What are the keywords in the following sentence? field of young trees in the fog
field, fog, tree

What are the keywords in the following sentence? small fishes between reefs and corals under the sea on a sunny summer day
coral, reef, sea

What are the keywords in the following sentence? Old locomotive steam engine, moving through rail yard
engine, move, yard