对于搜索引擎来说，正文内容和广告的区分不像在杂志上那么清晰。
PLAYBOY: With search engines, however, the line between editorial content and advertisements may become less obvious than in magazines.
结文：书内正文后的部份。它可以包括附录、词汇、索引等。
End matter: the final parts of a book after the main text. It may include "appendix", "glossary", "index", etc.
许多搜索引擎注重标题中的关键词，所以标题与正文中都要出现关键词。
Many search engines also give more points to words in headlines, so place your keywords there as well as in the body of the text.
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