The bar chart below gives information about the percentage of the population living in urban areas in the world and in different continents.
【主体段分段】：
<方法1>：按照【增长幅度】分段
- Body 1: World，Africa，Asia，Latin America and Caribbean【幅度较大】
- Body 2：Europe，North America【幅度较小】
<方法2>：按照【时间】分段(本篇文章采用此种分段方法)
【开头段】
The graph compares the growth in the proportion of urban population in five different regions as well as in the world as a whole in 1950, 2007 and projections for the year 2030.
【概述段】
We can find a constant increase in the percentage of city dwellers across all regions studied. This trend is anticipated to persist until 2030, and such change is especially pronounced in under-developed regions such as Africa.
思路要点：
- 所有地区数据都上升，并且到2030年也会继续上升
- 欠发达地区的涨幅更为明显
【Body 1】
Originally, roughly 29% of the population around the world resided in cities. This year, North America topped the list in terms of city population(nearly 64%), closely followed by the figure in Europe(around 51%) and that in Latin America and Caribbean(41%). On the contrary, in Africa, there were only 16% of people living in cities, 1% lower than the figure in Asia.
思路要点：1950年
- world：大约29%
- 其中，North America排(约64%)，Europe排第二(约51%)，Latin America and Caribbean排第三(41%)
- 对比而言，Africa只有16%→比Asia低1%
【Body 2】
After 57 years, the urban population worldwide almost doubled. Such growth rate could also be seen in Latin America and Caribbean, Africa and Asia. The other two regions, however, witnessed a rather modest rise in their city populations, with an increase of 20% in Europe and merely 15% in North America.
思路要点：2007年
- world：几乎2倍→Latin America and Caribbean, Africa，Asia也类似
- 其余2个地区幅度较小：Europe上升20%，North America只上升15%
【Body 3】
Looking towards the future, it is predicted that six out of ten people around the world will dwell in urban areas by 2030. Compared with the figures in 2007, the estimated increase rate in all the 5 areas will become slower, ranging from 9% to 11%. North America will still rank the first place regarding urban population, as urban areas will be populated by 88% of the residents.
思路要点：2030年
- world：2030年预计达到60%
- 5个地区增幅放缓，幅度在9%-11%之间
- North America：仍然排名, 数据为88%
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