When I lived in Colombia in the late 1990s, Medellín was the murder capital of the world, but it changed course, and it did this by deliberately investing in its low-income and most violent areas and integrating them with the middle-class ones through a network of cable cars, of public transport, and first-class infrastructure, and in the process, it dropped homicide by 79 percent in just under two decades.
九十年代末我住在哥伦比亚， 麦德林是当时世界经典的凶杀城市， 但是这个城市后来改变了， 这是因为刻意投资在低收入高暴力的地区 与中产阶级社区相融合， 通过缆车网络的接驳、 公共交通的联系、 一流基础设施的投入， 该城市在二十年内 凶杀率下降79%。