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。
应用推荐