In this mobile learning era, to give instructors and learners more convenient learning tools, the Department of Education Affairs has developed and converted teaching materials into e-books and other forms of digital materials. Based on the CEFR, ACTFL, and TOCFL standards, these teaching materials are divided into six levels: Breakthrough (A1), Waystage (A2), Threshold (B1), Vantage (B2), Effective Operational Proficiency (C1), and Mastery (C2).Users can use different platforms to read our e-books. Also, users can read them online or download them to their devices.