A fish swam in the river.

Meaning: A cold-blooded vertebrate animal that lives in water and has gills was moving through water by using fins or other body parts in a natural waterway that flows from a higher to a lower elevation.

Choice of Words: Swam means to move through water by using fins or other body parts, fish is a cold-blooded vertebrate animal that lives in water and has gills, and river is a natural waterway that flows from a higher to a lower elevation.

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Related Expressions