元数据允许rss阅读器了解诸如内容类型(文本还是多媒体)、出版日期之类的信息。

This metadata allows an RSS reader to understand such things as the type of content (text versus multimedia), the date of publication, and so forth.

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有了替代文本后，屏幕阅读器之类的辅助技术就可以以另一种方式传达图片的内容。

With alternative text the assistant technology, such as a screen reader, can convey the meaning of the image in an alternative way.

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Google 等搜索引擎可以识别、分类和索引您的文本内容，并且屏幕阅读器可以处理精确的文本内容。

Search engines like Google recognize, categorize, and index your textual content, and screen readers can deal with the accurate textual content.

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