Dewey decimal system
noun [ U ] uk/ˌdʒuː.i ˈdes.ɪ.məl ˌsɪs.təm/ us/ˌduː.i ˈdes.ə.məl ˌsɪs.təm/
杜威十进位分类法（一种图书馆书籍分类法，用三位数表示每本书的总类别和具体类别）
a system of organizing books and magazines, etc. in libraries, by which a book is given three numbers for each main subject and another number or numbers, after a decimal point (= a small solid circle) for its place within that subject