Modeling Product as a meta-class makes our model more flexible in that adding additional Products to the Catalog is purely a data-driven process and doesn't impact the class model.
将其他Product添加到Catalog完全是一个数据驱动过程，而且不会对类模型产生影响，因此将Product建模为一个元类会使我们的模型更加灵活。
Modeling Product as a meta-class makes our model more flexible in that adding additional Products to the Catalog is purely a data-driven process and doesn't impact the class model.
将其他Product添加到Catalog完全是一个数据驱动过程，而且不会对类模型产生影响，因此将Product建模为一个元类会使我们的模型更加灵活。
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