专家们一致认为在未来几十年内将出现一个难题：如何在不破坏地球的情况下养活90亿人口。
Experts agree that the next few decades will present a puzzle: how to feed nine billion people without wrecking the planet in the process.
读者不仅看到史密斯的成长，而且得知了一系列未来地球的情况和人类社会所有的弱点。
The reader not only watches Smith's growth, but also gets a tour of a futuristic Earth and all the foibles of human society.
对于地表地球的情况，你们正在跟此时的许多地壳运动抗争，有时候是其带来的反弹比如海啸。
As for the outer earth circumstance, you are struggling with many earth movements at this time and sometimes the repercussions of this such as tsunamis.
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