About 50% of the U.S. population owns a dedicated e-reader, according to a Pew Research study released last month. In addition, 28% read an e-book last year, up from 23% the previous year.

皮尤研究中心(Pew Research)在1月份发布的研究指出，美国约有50%的人拥有一部专门的电子书阅读器。此外，去年有28%的人读过一本电子书，高于前年23%的比例。

The services are expanding. Scribd, a San Francisco-based site that started selling monthly e-book subscriptions in October, announced Jan. 22 that its app is available on Amazon's Kindle Fire and Kindle Paperwhite. After running exclusively on Apple's operating system, New York-based Oyster plans to expand to Android later this year. And Entitle is considering adding an all-you-can-read feature to complement its current 'book of the month'-style subscription service.

此类服务还在逐步拓展。Scribd在1月22日宣布，该公司的应用可在亚马逊(Amazon)的Kindle Fire和Kindle Paperwhite上下载。这家总部位于旧金山的网站从去年10月开始推出按月付费的电子书订阅服务。位于纽约的Oyster也计划在今年晚些时候扩展至Android系统，此前它的应用只能在苹果(Apple)的操作系统上运行。此外，Entitle还在考虑新增“所有你能读的书”(all-you-can-read)这一功能，以补充其现有的“本月热门书籍”式的订阅服务。

Subscription services are popular because they 'reduce the emotional burden' of purchasing, says Julie Haddon, Scribd vice president of marketing. Buying a book creates pressure to finish and get your money's worth, she adds. In addition, people might try to save money by buying a cheaper book instead of the one they really want.

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