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。
The main goal of the Elaboration phase is to baseline the architecture of the system to provide a stable basis for the bulk of the design and implementation effort in the Construction phase.
精化阶段的主要目标是对系统架构进行基线化，为在构建阶段中的大量设计和实现工作提供一个稳定的基础。
Elaboration: the goal of the Elaboration phase is to baseline the architecture of the system to provide a stable basis for the bulk of the design and implementation effort in the Construction phase.
细化：细化阶段的目标是为系统体系架构设定基础，用来为构建阶段的大多数设计和实现工作提供稳定的基础。
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