First determine what books to borrow and find the right author and language; Then look up the book number on the inquiry machine in the library. In the electronic inquiry machine, you only need to enter the title of the book and press Enter to find the book number. For example, from left to right in I247.57/34: I stands for literature; The first two are China; The second number 4 stands for novel; The third number 7 stands for modern novels; The last 57 represent new novels and novellas; The slash/followed by 34 indicates the position of the book on the shelf.