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。

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.

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您应该能够“阅读”图书的封底内容，查看图书的前言，查看封面图片，以及轻松地(且愉快地)将书放入您的购物车并购买。

You should be able to "read" the back cover of the book, check out the book flap, see the cover art, and easily (and impulsively) drop the book in your cart and wander to the checkout line.

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