A paper book is a multi-page coexisting entity, an item with its complete material form, consisting of a cover, title page, catalog, preface, main body, postscript and other elements, which itself is a work of art occupying a certain space. This is the fundamental difference between paper books and e-books. In terms of transmitting information, there is no difference between e-books and paper books: but the two are virtual, one is physical, one is single-sided, and one is multiple pages. The coexistence of multiple pages of the book, although there are clumsy inconveniences, it has a unique advantage in terms of "tangible entities". Virtual forms such as e-books are of course light and fast, and they are stored in large quantities, but they cannot satisfy people's requirements for "tangible physical entities. " Demand. What does the above text mean? ['Paper books are difficult to completely replace with e-books.', 'The physical nature of the multi-page coexistence of paper books is the fundamental difference between paper books and e-books.', 'E-books have unparalleled advantages over paper books.', 'Paper books have obvious disadvantages compared to e-books.']