To better understand the concept of ownership, look at the stack of stacks data structure together with objects owned by each element.

为了更好地理解所有权关系的概念，可以将栈中栈数据结构与每个元素所拥有的对象结合起来。

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As you probably know, a stack is a data structure that is used to add and remove items in a last-in, first-out manner.

正如你可能知道的那样， 堆栈 是一种数据结构，被用来以后入先出的模式增加或移除条目。

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If you want to keep track of the relative nesting and context in which a tag occurs, you need to maintain your own stack, or other data structure.

如果要跟踪标签出现的相关嵌套和上下文，您必须维护自己的栈或者其他数据结构。

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