The characteristics of urban sub-climate and the harm of heat island phenomenon are analyzed, and methods to study heat island phenomenon are introduced.

分析了城市微气候的特点以及热岛现象造成的危害，介绍了研究热岛现象的方法。

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PEOPLE living in the towns of sub-Saharan Africa spend a bigger share of their income on food than do urban residents almost anywhere else in the world.

居住在非洲撒哈拉沙漠以南的地区的人，在粮食上的花费占收入的比例，几乎比世界其他任一城市地区的都大。

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Dengue is found in tropical and sub-tropical climates worldwide, mostly in urban and semi-urban areas.

登革热发生在全球热带和亚热带气候地区，多在城市和半城市地区。

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More than half the world's population already lives in cities and the urban population of sub-Saharan Africa is projected to double by 2030.

BBC: Africa: Feeding the rising urban population

Habitat, 62% of the urban population in Sub-Saharan Africa lives in slums, which it describes as being typically characterized by deplorable living conditions, a feeling of insecurity and inadequate infrastructure for basic energy, sanitation and water services.

CNN: High-tech shack brings solar power to slums

According to the Gates Foundation website, the focus of the family planning initiative will be on urban areas in sub-Saharan Africa and South Asia, areas where maternal and infant mortality rates are high and contraception use is low.

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