硬件的这个低级区域允许您从特定的设备（如 CD 或网络）启动重新设置挂起的系统，或允许您进入单用户模式。

This low-level area of the hardware allows you to reset a hung system, boot from a specific device (like a CD or a network boot), or get into single-user mode.

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选择网络传输方法，并在低级协议(如套接字、RMI、URL和文件等等)之中选择。

Select network transport method, choosing among low-level protocols such as sockets, RMI, URLs, files, and so on.

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在第2部分中，我介绍了如何用Parallel构造把较低级别的“构造块”进程组合成更高级别的进程网络。

In Part 2 I showed you how to use the Parallel construct to compose a network of higher-level processes from lower-level "building block" processes.

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