数据类别类似于抽象基类，比如，一个类别可以表示所有的汽车型号。

Data categories are like abstract base classes; a category might be able to represent all models of car, for instance.

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比如，据估计，三分之二吉列传感剃须刀的消费者可能也购买了吉列其他型号的剃须刀。

For example, it has been estimated that two-thirds of the sales of Gillette's Sensor razor came from consumers who would otherwise have been customers for the company's other razors.

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数据类别中的Data Items类似于该基类的子类，比如，一个汽车型号类别可能包含一个表示Ford Focus的数据项以及其他许多数据项。

The data Items within that category are like subclasses of that base; a category for car models will contain a data item which represents a Ford Focus, for instance, as well as many others.

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