Database designers have long used the term "star schema" to describe dimensional models because the resulting structure looks like a star.

数据库设计师长期使用术语“星型模式”来描述维度模型，因为结果结构看上去像一个星星。

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The structure of a star can often be thought of as a series of thin nested shells, somewhat like an onion.

恒星的结构经常被想象成一系列套在一起的薄层，就像洋葱一样。

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