可能你注意到，在图5.4中，我没有显示反向的一对多关系。

You'll note that I don't show the reverse multiplicities in Figure 5.4.

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使文件内容反向排列并不是常见的任务，但是以下几个一行程序显示了- n开关和- p开关并不总是处理整个文件的最佳选择。

Reversing the contents of a file is not a common task, but the following one-liners show than the -n and -p switches are not always the best choice when processing an entire file.

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图30还显示了两个提供定义反向链接能力的附加属性，即静态组和动态组如何维护关于其成员的信息。

Figure 30 also shows two Additional Properties that provide the ability to define reverse linkage, which is how groups maintain information about their members, for both static and dynamic groups.

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