英语翻译护封是书籍封面外的包封纸.印有书名、作者、出版社名和装饰图画,作用有两个：一是保护书籍不易被损坏；二是可以装饰书

Jacket is the outer casing of a book cover on which book name,author and publishing information are printed together with ornamental pictures (designs) if any.It has two functions -- protecting the book from being damaged and decorating the book to make it more appealing and classy.Jacket is an important component of a book.It functions as an advertisement as well besides its protection role.The design of a jacket has to primarily follow the four principles of aesthetics,pertaining,informativeness,and contemporaneity.The second part of its design has to show the five elements:text,image,color,composition of pictures,and material.The last but not the least point is the design of a jacket has to match the contents of the book.Jackets can be categorized in terms of crease as front cover,book spine,back cover,front flap,and back flap as well as the inner pages which are usually blank.The steps of jacket design are:preliminary sketch – presenting technique – design components.On many occasions,the success of a jacket design lies on a skillful color management and a great picture composition.The preliminary sketch will mainly solve the problems of what to present and how to present while picture composition is to bring what’s in the preliminary sketch into organized images.
Key words:jacket,significance,components,principles,element

Is the book's front cover letters for the encapsulation of paper. India has the title, author, publisher name and decorative pictures, there are two effects: First, the protection of books was not dam...