第三部分和第四部分为文章主体部分。
Chapter three and four constitute the body part of this thesis.
博客的文章是靠搜索引擎搜索到的，因此你应该在标题，副标题和文章主体部分使用相关的关键词。
Your blog posts will be crawled by search engines and therefore you should use relevant keywords in your headlines, subheads and body.
还记得么，Atom的设计初衷就是为了用于文章型文档，这类文档通常具有一个大标题，然后就是主体部分。
Recall that Atom is designed for article-type documents, which usually have a headline, then a main body.
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