| 摘要 |
PURPOSE: A book with a ring is provided to form a ring for sanitation in a book. CONSTITUTION: A book with a ring includes the following units. The ring(100) is formed on the top of the book. The ring is formed on one of the top of the inside of the book, on the top of text(10,11,12) of the book, or the top of the covers(20,21) of the book. |
