Because it's all digital, it eliminates the used book market and eliminates any sharing, and because homework and tests are through an access code, it eliminates any ability to opt out.

因为它全是数字化的，它淘汰了二手书市场，也杜绝了任何共享，而且因为作业和考试都是通过准入码进行的，它让人们失去了选择退出的任何能力。

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But because it's all digital, it eliminates the used book market and eliminates any sharing, and because homework and tests are through an access code, it eliminates any ability to opt out.

但因为它全是数字化的，它消除了二手书市场，也消除了任何共享，而且因为作业和考试都是通过准入码进行的，它消除了任何选择退出的能力。

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The rise of online second hand book platforms and sharing ideas also contributed to the booming book recycling.

网上二手书平台的兴起和想法分享也促进了图书回收的蓬勃发展。

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Paulo Coelho, the bestselling author whose novel The Alchemist has been dubbed by the Guinness Book of World Records as the most translated book by a living author (into a total of 53 languages), recently wrote an article strongly advocating for online peer-to-peer book sharing.

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The book's success is attributed to bloggers and the sharing of book reviews and recommendations on social media, as well as old-fashioned word of mouth advertising in physical coffee shops, and most probably at the school gates.

CNN: Erotic ebook surges up best seller list

Facebook pages have sprung up in its name and fans are invited to join the "Fifty Shades Support Group" on Good Reads, a book recommendation and review sharing site.

CNN: Erotic ebook surges up best seller list