As another example of where the process hierarchy plays a role, let us look at how UNIX initializes itself when it is started.
另外一个例子，进程继承结构作为一个角色，让我们看看在进程继承结构开始的时候，Unix是怎么初始化他们的。
When we look at the hierarchy, and the differences in process purpose, we begin to understand how to select and match the processes.
当我们看到层次和过程目的区别时，我们开始明白该如何选择并匹配这些过程。
This is one approach that enables the client to determine what member of the class hierarchy it receives, and process the additional information in the subclass accordingly.
这是一种可以使客户端能确定他接收到的是类层次中的什么成员的方法，并相应处理子类中的附加信息。
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