只有一个产品类型层次结构，但是可以有多个类别层次结构
There is only a single product type hierarchy, whereas there can be many category hierarchies
产品类型层次结构：这种层次结构中的每个类别代表一个产品类型。
Product type hierarchy: a category in this hierarchy represents a product type.
任何给定产品都可以划分到层次结构内的或跨许多层次结构的多个类别中。
Any given product can be placed into many categories within and across many hierarchies.
任何给定产品都可以划分到层次结构内的或跨许多层次结构的多个类别中。
Any given product can be placed into many categories within and across many hierarchies.
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