Fish swim swiftly in the sea.
Meaning: This sentence describes the natural behavior of fish, which is to move quickly and gracefully through the waters of the sea.
Choice of Words: Fish are aquatic creatures that live in water. Swim refers to the movement of fish through water using their fins. Swiftly means with great speed or agility. In indicates a location or position within something. Sea refers to the large body of salt water that covers much of the Earth's surface.
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