Just like the relationship between the trunk and the branches of a tree, the trunk dominates the branches, and the two cannot be juxtaposed or reversed. Books are comprehensive and are the general name of books. A book is a specific name. In fact, it is the same as the difference between people. China's books originally referred to classics, including books, picture books, pictures and other publications. Books in a broad sense refer to all kinds of reading materials, including Oracle Bone Inscriptions, epigraphy rubbings, hand scrolls, contemporary books and periodicals, newspapers, and even new technology products such as audio-visual materials, simple emblem films (volumes) and machine-readable catalogues. Books are an important part of books and the general name of bound books.