你有没有在大图书馆的图书索引卡中搜索过？
Have you ever raked through the paper card index of a big library?
网络站点通过提供图片、声音、电影剪辑以及灵活的索引和搜索工具来推广图书。
Web sites enhance books by providing pictures, sound, film clips, and flexible indexing and search utilities.
作者索引和学科索引可在图书馆的数据库中找到。
Author and subject indexes are available on a library database.
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