In the studied communities in the world, close to half the population is moving up or down the socioeconomic ladder, often with the same people rising and then falling at different times.
在世界上经研究的社区中，几乎有一半的人口正在社会经济的阶梯上向上或向下移动，往往是同样的人在不同的时间内上行而后又下跌。
Half century ago, only about one third of the world population belongs to cities, but in the year 2005, it will comes to more than estimated one half.
半个世纪以前，城市居民只约占世界人口的三分之一，但到2005年，城市居民预计达到一半以上。
But did you know Nepal is one of the poorest countries in the world? Its workers are in the bottom ten lowest paid in the world and half the population lives below the poverty line.
不过你知道，尼泊尔是世界最贫穷的国家之一，名列全球十大最低国民所得，全国有一半人口生活在贫穷线以下。
Lately their estimate is that in 2008, for the first time in history, more than half of the world population will be in urban areas.
最近，他们预计2008年，将会在历史上第一次出现城市人口多于农村人口的情况。
Lately their estimate is that in 2008, for the first time in history, more than half of the world population will be in urban areas.
最近，他们预计2008年，将会在历史上第一次出现城市人口多于农村人口的情况。
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