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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Figure 2 is simply pointing out the concept of Class, which is a highly specialized element that is related to interface and data type (through its inheritance from Classifier).

图2简单地指出了Class的概念，这是一种和接口以及数据类型有关(通过从Classifier继承)的高度专业化的元素。

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To overcome this, we picked the concept of streams: a stream (input or output) only deals with a subset of the data of an element.

为了克服这点，我们使用了流：一个流(输入流或输出流)只处理单个项的数据子集。

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