【答案解析】[参考范文]
The graph shows the increase in the aging population in China, Sweden and the USA. It indicates! hat the percentage of elderly people in all three countries is expected to increase to an astonishing proportion respectively: USA up to 15%, Sweden to almost 10, and China, to 25%.
It is obvious that China keeps a higher increasing rate in the aspect of elderly population. I think there may be several reasons for the phenomenon. On one hand, China began to carry out the family planning policy around 1980, which has brought out the effect 20 years later. The number of newborn babies decreased; therefore, the elderly population shows a sharp rise in the years around 2010. In contrast, elderly population increases in a much steadier rate in Sweden and USA. On the other hand, with the faster urbanization in China, more and more married couple would rather have a nuclear family model even a Dink one, so as to follow the urban living pressure and pace.
When the negative increase emerge, it is not surprising to see the sharp rise of elderly population. The proportion of older people will probably continue to increase in the next decades in the three countries, especially in China. This is an irreversible trend. And we have to pay more attention to its potential development and risks. [解析] 确定题型：图表题
确定主题：中国、瑞典、美国老龄人口的增长
确定对象：三个国家增长率的横向比较，以及中国老年人口增长的纵向比较
确定模板：图表题+因果型