The fish lives in a river or lake.
Meaning: This sentence is describing the habitat of a fish. It's saying that the fish lives in a natural stream of water that flows through the land or in a large body of water surrounded by land.
Choice of Words: River is a natural stream of water that flows through the land. Lake is a large body of water surrounded by land. When you put them together, "river or lake" describes the type of water body where the fish lives.
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Related Expressions