Scales shimmer like silver jewels.
Meaning: This sentence describes the fish's scales shining and reflecting light like precious jewels.
Choice of Words: Scales are the small, hard plates that cover the body of a fish. Shimmer means to shine with a soft, wavering light. Like is used to compare two things. Silver is a precious metal that is white and shiny. Jewels are precious stones that are used to make jewelry.
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