| 摘要 |
The book has a covering unit (1) with a book (3) and a covering unit (5), where the covering unit (5) has two cover sheets (9) made of semi-rigid plastic material and including dimensions of sheets (7) of the book. The cover sheets are connected with the book by a connecting unit at ridges of the book to form all sheets holding book with the appropriate covering unit. Plastic material of the cover sheets is translucently colored such that an end paper (7a) of the book is visible. |
