事实上，重用的概念从面向对象（OO）诞生的那天起就已经被人们很好的理解并应用。

In fact, the concept of reuse has been well understood and leveraged right from the day of object orientation (OO).

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然而，从面向对象方法的角度来看，数据建模非常类似于类建模。

However, from the standpoint of an object-oriented approach, data modeling is very similar to class modeling.

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从面向对象角度解释为：" 引起类变化的因素永远不要多于一个。

There should never be more than one reason for a class to change.

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