If you want to search the library holdings and don't know the author's name or the exact title of the book or an article, you have to set up a keyword search.
如果你想搜索图书馆藏书，却不知道作者的名字、书名或文章的确切名称，你必须设置关键字查询。
2
Here we have the title of the article, the category of the article and the nameof the website.
例子里，我们可以看到文章标题，类别和文章的网站名称。
3
For the purpose of this article, you can imagine it is actually the nameof a unit of data organization.