First, it is divided into several categories, such as science fiction, popular science, prose, poetry, education and so on, and then it is divided into small categories. For example, education can be divided into cultural education and interest education such as music, prose can be divided into domestic prose and famous foreign prose, etc ... and then it will be sorted by abbreviations, such as poetry prose, which will be written as sgsw. In this way, it is numbered. If you want to borrow books, just enter the abbreviation of the title, and it will show which section is on which floor and which row of which bookshelf. .