It ONCE was thought that social problems could be solved with smart urban design.
灵巧的现代城市设计可以解决纷繁的社会问题，这种想法在过去曾经一度出现过。
The expansion of urban areas in some African countries has been causing a significant fall in living standards and an increase in social problems.
在某些非洲国家城市的扩展已引起生活水平相当大的下降和社会问题的增多。
With environmental conservation and solve major problems of urban public lighting energy saving electricity costs, economic benefits and social benefits obvious.
具有环保节能，解决城市公共照明耗能大的问题，节省电费开支，经济效益和社会效益明显。
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