它还精心地引导我使用内存管理器的最后几个新功能：环境变量。
It also leads me nicely to the last new features of the memory manager: environment variables.
每个体系结构子目录都包含了很多其他子目录，每个子目录都关注内核中的一个特定方面，例如引导、内核、内存管理等。
Each architecture subdirectory contains a number of other subdirectories that focus on a particular aspect of the kernel, such as boot, kernel, memory management, and others.
BIOS需要执行很多工作，例如对基本组件(例如系统内存)进行初始测试，确定如何引导操作系统。
The BIOS has many jobs, such as initial testing of basic components (such as the system's memory) and determining how to boot the operating system.
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