这时,出自雅思考官之手的范文可以给我们一些启发。
The graph shows the increase in the ageing population in Japan, Sweden and the USA. It indicates that the percentage of elderly people in all three countries is expected to increase to almost 25% of the respective populations by the year 2040.
In 1940 the proportion of people aged 65 or more stood at only 5% in Japan, approximately 7% in Sweden and 9% in the US. However, while the figures for the Western countries grew to about 15% in around 1990, the figure for Japan dipped to only 2.5% for much of this period, before rising to almost 5% again at the present time.
In spite of some fluctuation in the expected percentages, the proportion of older people will probably continue to increase in the next two decades in the three countries. A more dramatic rise is predicted between 2030 and 2040 in Japan, by which time it is thought that the proportion of elderly people will be similar in the three countries.
范文采用的是按时间分段,也就是按时态的不同,进行分块说明。主体段第一段是描述过去发生的数据变化情况,第二段则是预计将来的发展趋势。这种按时态划分的思路,使得文章脉络清晰,让人眼前一亮。
那么如果时态一致,也就是说,时态不再成为划分图形依据的时候,是否又只能按曲线一条一条地写呢?其实不然,我们可以假设这幅图上的时间区间不是从1940到2040,而是从1840到1940,那么这时同样还是可以按照时间来划分的。当然,划分时间段不是绝对的,唯一的目的就是为了便于把内容清晰地表达出来。基于这个原则,这张图可以划分为三个时间段:第一段(1840-1880),美国和瑞典是在逐渐上升的,而日本则是缓慢下降到最低值;第二段(1880-1930),美国基本保持稳定,瑞典继续保持上升趋势,但是伴随着较明显的波动,日本从最低值开始稳步上升;第三段(1930-1940),美国、瑞典和日本三国的比例都是在快速上升的,其中日本的上升幅度最大。这样划分下来,可以发现,每个时间段内,各条曲线图的趋势还是相对单一的,因此比较好写,而且条理也清楚。
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