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

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。

youdao

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

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。

youdao