These are AIDS to finding articles on any subject. They list subject heading, with various titles of articles under them, together with the location of each article.
这些都可帮助你在任意主题上能找到相关文章。他们列出主标题，而主标题之下有文章的各式小标题还有每篇文章的所在位置。
They list subject heading, with various titles of articles under them, together with the location of each article.
他们列出主标题，而主标题之下有文章的各式小标题还有每篇文章的所在位置。
They list subject heading, with various titles of articles under them, together with the location of each article.
他们列出主标题，而主标题之下有文章的各式小标题还有每篇文章的所在位置。
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