A fish swims in the sea.

Meaning: This sentence describes a situation where an aquatic animal with fins and gills is seen moving through a large body of salt water using its fins or other body parts.

Choice of Words: Fish is an aquatic animal with fins and gills. Swim means to move through water using fins or other body parts. Sea is a large body of salt water. When you put them together, "A fish swims in the sea" means that an aquatic animal with fins and gills is moving through a large body of salt water using its fins or other body parts.

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Related Expressions