What are the keywords in the following sentence? canopy of tall gum trees contrasted against an aurora like evening sky .
contrast, sky, tree

What are the keywords in the following sentence? floating hotels have a way of flower ... flower decoration for ceremony
ceremony, decoration, flower

What are the keywords in the following sentence? dramatic night time view of the ancient city under a dark star filled sky
fill, sky, star, view

What are the keywords in the following sentence? Airplane wing and view of the earth from the window of a plane.
plane, view, window, wing