城市衰退指人口从城市流出，城市在衰退的一种倾向。
构建衰退产业识别模型对城市衰退产业进行筛选和分类；
The identification model is constructed to choose and classify the declining industries in cities.
因此，改变资源型城市衰退局面的办法也要从体制改革的角度入手。
Therefore, the solution must be taken by means of the reform of systems to solve the problem of the declining situation in resource-typed cities.
犯罪和城市衰败开始在街区显露，表明犯罪和城市衰退已经开始而人们还没有真正意识到。
Crime and urban decay can begin to build in neighbourhoods that signal that crime and urban decay has already begun and no one really CARES.
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