sales model短语¹¹⁴⁴⁶⁷⁺⁴ 基本例句 🌏销售模式；销售模型 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。 cnki