The ancient court libraries in China are divided into four categories: classics, history, books and collections, and the ancient court libraries are explained in detail. The Book of the New Tang Dynasty: "Both of them have four books, followed by A, B, C and D, and listed the classics, history, philosophy and collections." Therefore, later generations also called these four parts "Four Treasures". See "Four Parts".
Word decomposition
The interpretation of four is four names, three plus one (the word "four" is often capitalized on banknotes and documents): four sides. All around. Four orders (namely "four seasons"). Four bodies (a. refers to human limbs; B. It refers to four fonts: Kai, Cao, Li and Zhuan. Si ku (four ancient books: synonymous with classics, history, books and collections). Also known as "four"). Four gentlemen's storage room (storage room) Interpretation A house or place where things are stored: a warehouse. Ministry of Finance. Inventory. Last name. Radical: wide.