Let's say the world has only e-books, then someone introduces this technology called 'paper. ' It's cheap, portable, lasts essentially forever, and requires no batteries.
假设这个世界仅仅只有电子书籍，某一天，有个人发明了纸张这样一个技术，这个东西很轻便、携带方便、能使用很久，并且不需要供电。
Let's say the world has only e-books, then someone introduces this technology called 'paper. ' It's cheap, portable, lasts essentially forever, and requires no batteries.
假设这个世界仅仅只有电子书籍，某一天，有个人发明了纸张这样一个技术，这个东西很轻便、携带方便、能使用很久，并且不需要供电。
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