The examples provided with this article are designed to demonstrate RRD from a simple, base use case through subsequent, increasingly complex, use cases.

本文提供的示例旨在演示rrd，从一个简单的基础用例开始，然后介绍一些较复杂的用例。

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Since a NULL pointer terminates a list, we can also use the NULL pointer condition as a base case for many of our recursive functions on linked lists.

由于 NULL 指针会结束一个链表，所以我们也可以使用 NULL 指针条件作为基于链表的很多递归程序的基线条件。

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For example, the "how to enroll in a seminar" section of your system's user documentation could be written using the "enroll in seminar" use case as its base.

例如，可以使用“参加研习班”用例作为基础来编写系统用户文档的“如何参加研习班”一节。

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