Textbook publishers connect professors, instructors and students in ways that alternatives, such as open e-textbooks and open educational resources, simply do not.
Facing a downturn in book buying, and competition from online e-books, publishers are increasingly turning to cell phones.
面对低迷的图书市场，还有来自网上的竞争，出版商开始把目光转向手机。
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But some e-book buyers say that since publishers do not have to pay to print, store or distribute e-books, they should be much cheaper than print books.