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A Pearson spokesperson told BuzzFeed News that "digital materials are less expensive and a good investment" that offer new features, like audio texts, personalized knowledge checks and expert videos.

培生集团的一名发言人告诉 BuzzFeed 新闻，“数字材料更便宜，是一项不错的投资”，它提供了音频文本、个性化知识检查和专家视频等新功能。

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It's important to note that the Library of Congress is quite adept with the preservation of digital materials, as it's been handling these types of projects for more than a decade.

值得一提的是，国会图书馆的专长是保存数字材料，因为它有十几年处理这类项目的经验。

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Earlier this year, California invited content developers to offer digital math and science materials for high schools.

VOA: special.2009.08.27

This problem is being compounded as schools transition from inaccessible print to inaccessible digital materials.

WHITEHOUSE: After Helen Keller: Empowering Students with Disabilities | The White House

Directed by Satoshi Kon, who mixes drawn and digital materials, and based on a novel by the science-fiction writer Yasutaka Tsutsui.

NEWYORKER: Paprika

Digital materials include texts, databases, still and moving images, audio, graphics, software, and web pages, among a wide and growing range of formats.

UNESCO: Communication and Information