以blog post为例，可以在一个具有键category - list的项中存储类别列表。

Using the blog post example, you might store the list of categories in an entry with the key category-list.

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但是成本可划分为两个高级类别：物理存储生态系统本身的成本和管理它的成本。

But cost can be divided into two high-level categories: the cost of the physical storage ecosystem itself and the cost of managing it.

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问题本身被存储为类别。

The questions themselves are stored as categories.

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