它被组织成一个层次结构，以表示术语和概念的隶属关系，通常与内容管理、知识管理和搜索技术关联。
It is organized into a hierarchical structure to convey the parent-child relationship of terms and concepts and often associated with content management, knowledge management and search technologies.
这让我们理解了焦点遍历层次结构的概念，从而明白了向上和向下的焦点循环的概念。
This brings us to the concept of focus traversal hierarchy, and therefore of up and down focus cycles.
在本文的以下小节中，我们将使用一个小而简单的例子来说明这个层次结构的概念。
In the following sections of this article, we use a small and simple example to illustrate this concept.
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