Birds fly high above treetops.

Meaning: The birds are flying at a high altitude, higher than the tallest trees.

Choice of Words: Fly means to move through the air with wings. Birds are animals with feathers and wings that can fly. Treetops are the highest parts of trees. When you put them together, "Birds fly high above treetops" is a simple sentence that describes how birds fly higher than the tops of trees.

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