Study of population size hierarchy is the groundwork of the city planning. It is important to the population forecast of cities and urban system planning.

城市规模分布研究是城市规划中的一项基础性研究工作，对准确预测城市人口规模以及合理确定城镇体系结构具有非常重要的意义。

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The term "urban and rural planning" as mentioned in this Law includes urban system planning, city planning, town planning, township planning and village planning.

本法所称城乡规划，包括城镇体系规划、城市规划、镇规划、乡规划和村庄规划。

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The paper deals with some important problems including urban area concept, residential structure, urban morphology evolving by stage, and urban system planning of municipal area.

作者探讨了城市规划研究中的城市地域概念问题、居住分化问题、城市形态演化的阶段性问题和市域城镇体系规划问题。

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Yayat Supriatna, an urban planning expert, told the BBC that Jakarta's drainage system "is still the same as it was in the Dutch colonial era" and should be rebuilt.

BBC: Indonesian capital Jakarta hit by deadly flooding

The practice has become increasingly controversial in recent years, feeding public anger over a family-planning system that critics say falls particularly hard on the urban poor who often can't afford to pay the fine to have a second child.

WSJ: China Suspends Officials in Forced-Abortion Case