Mighty humpback whales breach waves.
Meaning: This sentence describes humpback whales, which are large and powerful whales, coming to the surface of the water, breaking through the waves.
Choice of Words: The word mighty means having great strength or power, like a humpback whale. Humpback whales are large whales with a hump on their backs. Breach means to come to the surface of the water, like a humpback whale breaching the waves.
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