For more than 500 years the book has been a remarkably stable entity: a coherent string of connected words, printed on paper and bound between covers.
500多年来，书一直是相当稳定的物体：由具有条理的字符串连而成，被印在纸上，有封面和封底。
The book was bound in paper covers.
这本书是平装的。
Wrappering: Attaching a paper or board cover by gluing at the spine of a book block which may be stabbed, adhesive bound or sewn.
包封面：在书芯(用铁丝平订，胶装或线装造成)的脊部加胶，贴上纸或纸板书皮的情况。
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