There will be one or more attributes from Di, which are referenced by the join object, which is used to join Di to the facts object.

用来将 Di 联结到事实对象的联结对象会引用 Di 的一个或多个属性。

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The Join object has left-side attributes and right-side attributes, which are compared to each other to form join predicates.

联结对象具有左属性和右属性，对这两个属性进行比较，从而形成联结谓词。

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