The ocean stretched out before them, its vastness like an endless mystery.
Meaning: The ocean was very large and extended out in front of them, and its size was like a mystery that could not be solved.
Choice of Words: Stretched means to extend or reach out. Before means in front of or ahead of someone or something. Vastness means very large or great in size. Endless means having no end. Mystery is something that is not known or understood.
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