It had many layers.
Meaning: This sentence tells us that the expression or application of the girl's creative skill and imagination had a large number of distinct levels or strata.
Choice of Words: It is a pronoun that refers to something that has already been mentioned or is understood from the context. Had is a verb that indicates possession or ownership. Many is an adjective that describes a large number. Layers are distinct levels or strata of something.
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Related Expressions