Between now and 2050, the urban population of Africa could triple.

从现在到 2050 年，非洲城镇人口可能增加两倍。

There are other tiny creatures which take advantage of dense urban populations.

有些更小的生物会利用密集的都市人口而生存。

One third of the urban population is breathing polluted air. Finally, seven of the world's ten most polluted cities are in China.

三分之一的城市人口呼吸着受到污染的空气，还有，世界上10个污染最严重的城市，有7个就在中国。

If you read the chapter “honkers move to the city” and you'll find some reservations about an urban geese population, but mostly bragging.

如果你读过“鹅迁徙到城市”这一章，你会发现一些关于城市鹅数量的保留意见，但主要是吹牛。

Increasing mechanization of the canning process, coupled with a huge increase in urban populations across Europe, resulted in a rising demand for canned food.

罐头加工技术的提高，加上城市人口的大幅增加，导致欧洲对罐头食品的需求不断增长。

The urban population is going to double.

城市人口将增加一倍。

But since the 1970s their urban population has exploded.

但自 20 世纪 70 年代以来，城市人口呈爆炸式增长。

In short, one of the most perfect locations on the entire planet to conduct large-scale agriculture that could support a huge and growing urban population.

简而言之，这里是整个地球上最适合发展大规模农业的地方之一，可以养活数量庞大且不断增长的城市人口。

As urban populations increased, unemployment, overcrowding and poverty became widespread.

随着城市人口的增加，失业、过度拥挤和贫困变得普遍。

When urban populations grow, even some politicians and even some activists will resist greater density.

当城市人口增长时，甚至一些政客甚至一些活动家都会抵制更高的密度。

The urban population in Beijing was about 19.161 million, accounting for 87.5 percent of the capital's total permanent population.

其中，城镇人口1916。1万人，占常住人口的比重为87。5%。

You also mentioned in your story that for China's urban population, the government is planning to raise the retirement age.

您在报道中还提到，对于中国城市人口，政府正在计划提高退休年龄。

With the urban population and the horse population in the cities swelling in tandem, these streets became a muddy, unhealthy morass.

随着城市人口和城市马匹数量的不断膨胀，这些街道变成了泥泞、不健康的沼泽地。

From the Nile Delta, it is nearly a thousand kilometers across the barren and rainless Sahara to the West before you reach another area that actually receives enough rainfall to support another Urban population — modern-day Benghazi, Libya.

从尼罗河三角洲出发，向西穿越贫瘠无雨的撒哈拉沙漠近千公里，才能到达另一个降雨量足以养活另一个城市人口的地区——今天的利比亚班加西。

Due to the agricultural  economy of the South and its westward expansion, its urban population outnumbered the rural only  during the 1910s.

由于南方的农业经济及其向西扩张，其城市人口仅在 1910 年代才超过农村人口。

In cities with an urban population of over 3 million, construction of buildings above 500 meters is banned, and buildings taller than 250 meters can only be allowed under strict restrictions.

城区常住人口三百万以上城市严格限制新建 250 米以上超高层建筑，不得新建 500 米以上超高层建筑。

First, with the increase of urban population around the world, the massive construction of urban infrastructure and residential housing is hard to avoid.

首先，随着世界范围内城市人口的增加，城市基础设施和住宅的大规模建设是不可避免的。

On the one hand, the development of houses in these areas can help to meet the increasing demand for housing as urban populations continue to grow.

一方面，随着城市人口的不断增长， 这些地区的房屋开发有助于满足日益增长的住房需求。

At its highest point, the city had a bustling urban population of 18,000 people and was one of the major African trade centers at the time.

在最高点，这座城市拥有 18, 000 人的繁华城市人口，是当时非洲主要的贸易中心之一。

Globally, urban populations are expected to double in the next 40 years, and an extra 2 billion people will need new places to live, as well as services and ways to move around their cities.

在全球范围内，未来 40 年城市人口预计将翻一番，新增的 20 亿人需要新的居所和服务，以及在城市活动的交通道路。