This scenario-based technique lets you walk through the whole system or process, step by step, as a user.
这种以情景为背景的技巧可以帮助您以用户的身份按步就班地将整个系统或流程走过场。
This section walks through the construction of a few system calls to demonstrate their implementation and use by a user-space application.
本节将介绍几个系统调用的构造，从而展示它们的实现和用户空间应用程序对它们的使用。
Unfortunately, this system can be difficult and time consuming, because it requires the user to navigate through all the intermediate components just to get to the one he needs.
遗憾的是，这个系统难以实现并且很费时，因为它要求用户导航所有中间组件才能到达它需要的那个组件。
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