比如免费的计算机操作系统Linux，还有免费的百科全书Wikipedia。
Take Linux, the free computer operating system, or Wikipedia, the free encyclopedia.
它是一个免费的百科全书，包括人文地理事件，物件，观念，每个人可以上传或编辑。
It is a free encyclopedia of information about people, places, things, events and ideas that anyone can write, add to or edit.
免费的百科全书Wikipedia提供了对计算语言学和上下文无关语法的概要介绍，并且给出了关于它们两者的资料的有用链接。
Wikipedia, the free encyclopedia, offers an overview of Computational linguistics and context-free grammars with, as always, good links to more information about both.
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