Your loss should be twice the book price. The reason for not returning the book may be that it is lost. In that case, you can buy a copy from the bookstore to make it up. I have another idea. Take a book about the same size, package it according to the style of the library, and write the title. Later, this matter was returned by many books, and Li became stiff. Sometimes I can't find it. O(∩_∩)O~