专家们注意到“教科书是有层次的，就像洋葱一样”。对于主动学习者来说，接触课本是一种具有互动性的体验。
Experts observe that "textbooks come in layers, something like an onion". For an active learner, engaging with a textbook can be an interactive experience.
理解这些层次的生命是不可能的，但是每次我们必须制定出一个互动、一个机制和方法。
Understanding life on these scales is not impossible, but we have to work it out one interaction, mechanism, and pathway at a time.
NFL 玩家ChadOchocinco已将这一层次的互动推向一个全新的水平，没有什么能阻止普通人去做这种尝试（尽管涉及到隐私）。
NFL player Chad Ochocinco has already taken this level of interaction to a whole new level. And nothing is to stop the average person from jumping onboard, too (privacy concerns notwithstanding).
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