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.
然后feed阅读器就可根据给出的类别拉出所需的分类后feed。
Feed readers then pull categorized Feeds knowing that any required Categories are present.
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