Active Record is an object-relational mapping (ORM) that follows a standard ORM model.

Active Record是遵照了标准的or m模型的对象关系映射(object - relational mapping, ORM)。

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It has a domain model representing the major entities within the system, and USES an ORM framework to map the domain model to the database.

这个应用使用领域模型表示这个系统中的实体，并使用ORM框架把领域模型映射到数据库上。

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Revisiting the model: Letting the ORM select behavior.

再论模型：让OR M选择行为。

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