The E commerce models of digital library to information users include subscription based sales model, pay per view model, online compliment model and pre paid model.
数字图书馆对信息用户的电子商务模式主要有网上订购、付费浏览、网上赠予以及预付模式。
Digital sales were up, however, and subscription-based services appear poised for growth.
但是数字音乐销量反而上升，而且基于订阅的服务表现出稳定增长的态势。
Digital sales were up, however, and subscription-based services appear poised for growth.
但是数字音乐销量反而上升，而且基于订阅的服务表现出稳定增长的态势。
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