类似地，XML是一种元语言，因为它是一种描述语言的语言。

Likewise, XML is a metalanguage because it's a language that describes languages.

youdao

它能作为定义数据描述语言的语言，例如标记语法或词汇、交换格式和通讯协议。

It can be used as a language for defining data descriptive languages, such as markup grammars or vocabularies and interchange formats and messaging protocols.

youdao

现在，描述语言的演化、展示语言之间的相互关系的一种方法，是用系谱图模型。

Now, one way of representing the evolution of languages, showing the way languages are related to each other, is with the family tree model.

youdao

To do that, we need to describe: not only, what are the primitives, but how do we capture things legally in that language, and interact with the computer?

为了达到这个目的，我们需要描述：,包括程序基本的东西，以及怎么在这种语言中，做我们想做的事情并和计算机交互？

麻省理工公开课 - 计算机科学及编程导论课程节选

You could use language to describe music, talk about the--a musical language or art, or any communicative system, and there's actually nothing wrong with that.

也可用来描述音乐,即音乐语言,或是去描述艺术,或任何的交流系统,都是没问题的

耶鲁公开课 - 心理学导论课程节选

As we'll discuss later, the language that gets used with these things is very interesting.

我们今后会讨论,描述食物的语言也非常有趣

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选