An object can have multiple relationships with other objects.
一个对象可以和其它对象有多种关系。
At each object level are the properties and relationships relevant to each object.
在每个对象层上，都有与每个对象有关的属性和关系。
It is highly uncommon to have an object model without any relationships.
对象模型没有任何关联是很少见的。
It is highly uncommon to have an object model without any relationships.
对象模型没有任何关联是很少见的。
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