Product type hierarchy: a category in this hierarchy represents a product type.
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。
There is only a single product type hierarchy, whereas there can be many category hierarchies
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
In creating categories, recognize that each Category name must be unique, regardless of hierarchy.
创建类别的时候，要了解到不管类别层级是多少，每个类别名称必须是唯一的。
The manner is a semantic category and there is a grammatical hierarchy in it.
方式是一个语义范畴，方式状语范畴内有一个语法等级。
The manner is a semantic category and there is a grammatical hierarchy in it.
方式是一个语义范畴，方式状语范畴内有一个语法等级。
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