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可在安卓獲取NGL eSamples的歷史版本
宣傳冊，章節的數字採樣，和許多程序的書籍。
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.翻譯中...
NGL eSamples
4.5.0 by Cengage Learning
2018年09月24日