免费电子书或视频书籍。
传统书籍只能使用图片和插图，而电子书可以为读者提供无限的链接：文本、图片和视频。
Where traditional books had to make do with photographs and illustrations, an e-book can provide readers with an unlimited number of links: to texts, pictures, and videos.
也有文物的图片和视频，如编钟和书籍。
There are also pictures and videos of the relics (文物) , such as bianzhong and books.
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