Fish swam swiftly through coral reefs.

Meaning: The fish moved quickly and easily through the underwater structures made from the hard outer skeletons of tiny sea animals called coral polyps.

Choice of Words: Swam is the past tense of swim which means to move through water. Swiftly means moving quickly and easily. Coral reefs are underwater structures made from the hard outer skeletons of tiny sea animals called coral polyps.

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