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宣传册，章节的数字采样，和许多程序的书籍。
National Geographic Learning eSamples provides digital samples of our programs, resources, professional development courses, and books. Explore our interactive eSamples to view digital versions of brochures, sample chapters, and sample books of many programs.最新版本4.5.0更新日志
Last updated on 2018年09月24日
-Improved App Performance
-Updated App User Interface
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NGL eSamples
4.5.0 by Cengage Learning
2018年09月24日