There is a good coupling between the degree of the natural frangibility and the density of population and the water resource of per capita.

自然脆弱度与人口密度、人均水资源量之间存在着较好的耦合性。

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Floodway; high-flow diversion Natural or man-made bypass channels or conduits that redirect flood waters around or away from urban centers or area of high population density.

泄洪道，分洪道，溢流槽天然或人造的泄洪渠或泄洪管道，以引导洪水绕过或远离城市中心或人口稠密地区。

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Moreover, with the exception of the continent's handful of natural resource-rich, low population-density countries like Angola (see my September 9, 2008 column advocating an intensified strategic engagement with the geopolitically significant Southern African country), most of America's would-be partners are constrained by lack of the financial wherewithal to upgrade their capabilities to meet even short-term priorities.

CENTERFORSECURITYPOLICY: A stimulus for African security

Population density not only increased the vulnerability of urban centres but magnified the impact of natural disasters, delegates heard.

BBC: NEWS | Science/Nature | Losing sight of the countryside