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。
3
Others are impossible to search because you can't remember a name or an exact year.