城市的快速发展可能引起社会和经济问题，比如污染和交通问题。
The rapid expansion of cities can cause social and economic problems, such as pollution and traffic problems.
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.
位于西雅图东部的贝尔维尤是一个快速发展的城市，它使用了一个在十字路口信号周围越来越受欢迎的系统，该系统可以根据交通状况实时调整。
Bellevue, a fast growing city, just east of Seattle, uses a system that is gaining popularity around the intersection signals that can adjust in real time to traffic conditions.
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