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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假如不熟悉阻塞队列概念，它实质上就是一种带有一点扭曲的FIFO数据结构。

For those unfamiliar with the concept of a blocking queue, it is essentially a FIFO data structure, with a twist.

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它还构建在外部描述的数据结构的概念之上，这是固定列表动态sql使用的主机变量的一种软编码方法。

It also builds upon the concept of externally described data structures, a way of soft coding the host variables used by fixed-list dynamic SQL.

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