编写系统程序，作为电脑运行系统的一部分；在电脑设备当中提供日常服务及进行数据信息管理。

Writing systems programs which form part of the operating system of the computer, providing utility services or managing data communications between computing devices.

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从这本书里，我学到了如何对UNIX系统编程，并且，一旦我需要编写依赖于UNIX系统性能的程序时，我就需要不断地参考这本书。

I learned how to program UNIX systems from this book and continually reference it whenever I have to write programs that depend on UNIX system capabilities.

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MIT计算机科学人工智能实验的研究员们希望改变这种状况，他们开发了一个可以让人们利用GUI的截图来编写程序的系统。

Researchers in MIT’s Computer Science and Artificial Intelligence Lab hope to change that, with a system that allows people to write programs using screen shots of GUIs.

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