With the popularization and development of cloud computing technology and intelligent terminal, the "Cloud Computing Service + Cloud Terminal" model (abbreviated as "Cloud + Terminal" model) which consists of the education cloud service and the cloud terminal creates a new teaching and learning context for digital textbooks. Firstly, this paper introduced the system of the education cloud service and the "Cloud + Terminal" model. Secondly, based on the deep analysis on the elements and features of the Personal Learning Environment (PLE), this paper constructed the PLE model for digital textbooks under the "Cloud + Terminal" model, and further introducted the main function of it. Finally, the learning system of digital textbooks under the "Cloud + Terminal" model was designed from the four aspects of terminal equipment, tools software, digital textbook content and the education cloud service platform. The results of this paper had reference value and guiding significance to the design and development of digital textbooks learning system and the construction of learning environment.%随着云计算技术与智能终端的普及与发展,教育云服务与智能学习终端组成的"云计算服务+云终端"模式(简称"云+端"模式)为数字教材开辟了全新的教学场景与学习情境.文章首先介绍了教育云服务体系和"云+端"模式;随后,在深入分析个人学习环境要素与特点的基础上,文章构建了"云+端"模式下面向数字教材的个人学习环境模型,并介绍了其主要功能;最后,文章从终端设备、工具软件、数字教材内容与教育云服务平台四个层面,设计了"云+端"模式下的数字教材学习系统.文章的研究内容对于数字教材系统的设计、开发和学习环境的构建具有参考价值与指导意义.
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