...城市边缘区的含义 学术界关于城市边缘区的概念有多种提法, 如城市边缘带(urban fringe) 、城市蔓延区(the area of urban sprawl) 、城乡结合部(city -country fringe ) 、城市阴影区(urban shadow area) 、城乡交错带(urban -rural fringe) 等.
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这两个国家都在准备开展大规模预防接种运动以保护危险人口和防止该病向人口密集的城市住区蔓延。
A mass vaccination campaign is being prepared in both countries to protect the population at risk and to prevent the spread of the disease to densely populated urban Settings.
这项发表于《自然》杂志现刊的研究发现艾滋病毒于1884年到1924年之间开始蔓延，大约与此同时中非西部地区的城市中心区也开始兴起。
The research, which is published in the current issue of Nature, found that HIV began spreading between 1884 and 1924, around the same time urban centers in west central Africa were established.
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