An entity class is a class that represents an entity in a business model. In our model, the entity classes are Customer, Order, and OrderItem.

一个实体类在业务模型中代表着一个实体，在我们的业务模型中，实体类是Customer、Order、和OrderItem。

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An entity class is a class that represents an entity in a business model. In our model, the entity classes are Customer, Order, and OrderItem.

一个实体类在业务模型中代表着一个实体，在我们的业务模型中，实体类是Customer、Order、和OrderItem。

youdao