The fish swims swiftly in the river.
Meaning: The fish is moving quickly through the water using its fins or tail.
Choice of Words: Fish is an aquatic animal with fins and gills. Swims means to move through water using fins or a tail. Swiftly means at a high speed or quickly. In indicates a location or position. River is a natural waterway with flowing water. This sentence describes the fish's rapid movement through the water.
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