人口学家估计，到2050年，将有四分之三的人类居住在城市，其中大部分将来自亚洲和非洲快速发展的城镇。
Demographers reckon that three quarters of humanity could be city dwelling by 2050, with most of the increase coming in the fast growing towns of Asia and Africa.
该发现被认为具有60万年的历史，是全世界人类居住的最古老标志。
The find was believed to be over 600,000 years old - making the oldest signs of human habitation in the world.
思考着未来的四百年，桑德森回到了原来的问题：如何建造适宜人类居住的城市？
Thinking four centuries ahead, Sanderson returns to the question of how to build liveable cities.
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