The height of the bookshelf is too high. You can build a ladder to get the books. Bookshelf is an instrument specially used by people to put books. Because of the different forms and structures of bookshelves, there are different names such as bookcase, bookcase and book partition. Bookshelves are common appliances in life. Bookshelves in libraries can be divided into metal bookshelves and wooden bookshelves according to materials, and metal bookshelves can be subdivided into single-column bookshelves, multi-column bookshelves, stacked bookshelves, dense shelves and sliding bookshelves.