为了让您能更好地理解 refresh() 方法，我先来简单介绍一下我所使用的自定义的数据结构。

You'll understand the refresh() method better with a brief explanation of the self-defined data structures that I am using.

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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。

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

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标识可疑数据结构有助于更好地理解内存泄漏的根源。

Identification of suspected data structures aid in a better understanding of the root cause of a memory leak.

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