这些变量常常用XML表示，XML提供了一个灵活的框架允许文档作者使用自定义的标签和标记描述内容。

The variables are often expressed using XML, which provides a flexible framework for document authors to describe content using custom tags and markup.

youdao

海斯表示，很多在线图片多少有些地理标签，不过这些描述可能经常有错误或者太过于宽泛，例如一张美国大峡谷的照片被标记为美国。

Hays said many online photos have some sort of geographic label, but these human descriptions can often be incorrect, or overly broad, such as a photo of the Grand Canyon labeled "U.S."

youdao

虽然我可以表示“我的旅程是从丹佛到罗利，途经圣何塞和西雅图”，但地图将能更好地描述旅途路线。

I can say, "I'm taking a trip from Denver to Raleigh, with stops in San Jose and Seattle along the way," but a map would help describe the trip better.

youdao

And this structure that I've depicted here using the X's and O's is called the Lewis structure.

我在这儿描述的结构,用X和O表示电子的方式叫做Lewis电子式。

麻省理工公开课 - 固态化学导论课程节选

If you are describing a particle with location R, the vector we use typically to locate a particle, R then R is just i times x + j times y, because you all know that's x and that's y.

如果你要描述一个位移为 R 的质点,这个矢量一般用表示质点 R 的位移,R 可表示为 i ? x + j ? y,显然你们都知道这段是 x,那段是 y

耶鲁公开课 - 基础物理课程节选