The purpose of an e-reader or a tablet is to function as a book; smaller, thinner, lightweight — no bigger than a standard paperback — plus comfortable and easy to read.

电子阅读器或者平板电脑的目标是充当书本：小一些、薄一些、轻一些——不要比标准的平装书大——阅读起来舒适容易。

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Ms. Buchanan, co-author of the bestseller "The Daring Book for Girls, " says she set out to create a multimedia story that took advantage of the protean nature of the latest e-readers, which can function as a book one moment and a photo album or movie player the next.

WSJ: Enhanced E-Books: Blowing Up the Book