The fish swims quickly in the sea.
Meaning: This sentence describes the action of a fish using its fins or other body parts to move through a large body of salt water at a fast pace.
Choice of Words: Swims is a verb that means to move through water using fins or other body parts. Quickly means to move at a fast pace. Sea is a large body of salt water. When you put them together, "The fish swims quickly in the sea" means that the fish is using its fins or other body parts to move through the water at a fast pace in a large body of salt water.
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