如果取代所有煤、石油、核能有多大大家可以想象一下。
If replace all the coal, oil, nuclear power, one can imagine how big it is.
大家能否想象一下，如果有一天，我们没有了纸张。世界会变成怎样？
Let's imagine what the world be like when we no more have any paper?
其实大家可以想象一下金字塔的外形，或许可以受到一点启发。
Actually you can get enlightened by imagining the pyramid shape.
其实大家可以想象一下金字塔的外形，或许可以受到一点启发。
Actually you can get enlightened by imagining the pyramid shape.
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