Web sites enhance books by providing pictures, sound, film clips, and flexible indexing and search utilities.
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。
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Imagine a world where sunlight can be captured to produce electricity anywhere, on any surface. The makers of thin-filmflexible solar cells imagine that world too.