I began by scanning each chapter's summary and got drawn into the details in most of the chapters, even if I had a pretty good idea of the topics.
即使我对这个主题有很好的理解，我也会浏览每个章节的概要，然后认真阅读绝大多数章节的细节。
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Now, though, NPR has managed to uncover the details behind the company's patented book scanning system - and found that the secret is 3d infra-red cameras.