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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We in the 21st century, when the urbanization should consider these new factors, avoid to the center city population concentration and detours.

我们在21世纪推进城市化的时候，是否应该考虑这些新因素，避免人口过度向中心城市集中而走弯路。

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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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Yet he fails to mention Omar Mukhtar, the Libyan hero whose insurrection against the Italian invaders lasted 20 years, and the brutal suppression of which entailed herding much of Libya's population into concentration camps, where many died.

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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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