The mermaid gracefully swam through the ocean.
Meaning: This means the mermaid was moving through the water in a very smooth, elegant, and effortless way.
Choice of Words: Gracefully means in a smooth, elegant, and effortless manner. Swam means to move through water using your arms and legs. Ocean is a large body of salt water. When you put them together, "gracefully swam through the ocean" means to move through water using your arms and legs in a smooth, elegant, and effortless manner in a large body of salt water.
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