这些数据不仅能够非常安全地被加密在数字带中，而且，甚至连强大的计算机都察觉不到这个数据库的存在。

Not only can the data be securely encrypted within a digital tape, but the library's existence on the tape would be invisible even to powerful computers.

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即使这样，因为差别看起来是随机的，人们会认为是在用模拟CD播放器复制数字带时(通常就是这么做)产生的噪音。

Even then, the random-looking differences would appear to be noise acquired while duping a digital tape through an analog CD player (as is normally done).

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总的来说，对于数字足迹的分析展示了瀑布所带的冲击，以及久而久之它会促使人们访问城市的其他区域。

Overall the analysis of digital footprints showed the impact of the waterfalls, and how they drove people to new parts of the city over time.

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So let's take those ideas and go back to the numbers game from last time.

那么我们带着这些方法,回到上次的数字游戏中

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