With the rapid expansion of city size and population concentration, improving the urban disaster prevention system has become a daunting task can not be ignored.
健全城市防灾系统成为一项不容忽视的艰巨任务，这是由城市规模的急速扩大和人口的过度集中所造成的。
Population concentration is affected by many factors, among which the household registration system is a major one.
影响人口聚集的因素很多，其中，户籍制度是一个重要因素。
Population concentration is affected by many factors, among which the household registration system is a major one.
影响人口聚集的因素很多，其中，户籍制度是一个重要因素。
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