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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With the quicker course of urbanization and population concentration, the amount of excrement and urine in cities are steadily on the increase.

随着我国城市化进程的加快和人口大量集聚，城市人粪尿与日俱增。

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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。

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He said it was important for the restrictions to take into account the concentration of population near a store.

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"Rising fuel prices and the increasing concentration of the population in urban areas is bringing about serious logistical problems for the delivery of food, " he says.

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The building of more freeways in relatively low-population areas will not solve the congestion problems in the cities where the concentration of buyers is located.

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