This content-by-reference mechanism provides a very flexible means of expanding the types of content that one can syndicate through Atom.
这种基于引用的内容(content - by - reference)机制提供了一种非常灵活的机制，可用于扩展通过Atom联合的内容类型。
By playing off of something that everyone already knows--for example, a popular song, movie or a TV show--people will have a reference point to relate to your content.
使一些大家都知道的东西出丑——比如，一首流行的歌，一部电影或者一文件电视节目——观众会有一个参考点关联到你的内容。
MathML3 adds attributes to csymbol to allow explicit reference to OpenMath Content Dictionaries and further aligns with OpenMath by the addition of some extra structural elements.
MathML3向csymbol添加属性，以允许对OpenMath Content Dictionaries的显式引用，并通过添加一些额外的结构元素，进一步贴近openmath。
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