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1. 首先，明确动态图：数据随着时间的变化而变化；
2. 描述的是两个年份(2000 和 2050)中也门和意大利的人口年龄结构的对比，时态确定为一般过去时和一般将来时;
3. 该图的主要特征：也门60岁以上的人比例最少; 意大利 0-14 岁的保持最低水平，15-59 岁的比例都处于最高部分。
写作思路
我们可以采取普通的四段式结构，即开头段把题目进行转述，介绍两组图的基本情况。第二段主要描写也门 2000年和2005年人口年龄的对比，第三段描述意大利相应的数据。最后一段对两个国家的人口年龄情况做对比和总结，结束全文。
范文解析
The pie charts reveal the breakdown of three age groups in two countries- Yemen and Italy--in the year of 2000 and the prediction for 2050.
第一段:转述题目，概括全文大意。
In Yemen, roughly a half of the population was the youngest, closely followed by the older age group people. As low as 3.6% went to the elderly. In five decades, by contrast, this situation is not expected to change a great deal, only that 15- to 59- year-old people will become the dominant part whereas the young is forecast to fall to a third.
第二段:该段主要写也门的人口情况，值得注意的是，饼图在分类描述时通常先写最多比例的，然后依次列比例少的，同时这段中没有重复使用年份的时间，而是通过 in five decades 体现具体描述的对象。在写2050年预测时，使用 by contrast 作为明确的对比 指示词。
On the other hand, Italian population saw less discrepancy in terms of ages, where in early 21th century 61.6% were the older adults while the other two categories were both less than a quarter. It is estimated that the gap between the two older groups is going to be even smaller (46.2% and 42.3% respectively), though the 0-14 yeas old will only account for 11.5%.
第三段:作者在这段中先写意大利2000年人口比例，同样也是先描述占比例多的人口年龄组，之后，也写了预测的人口比例，并且在数据的表达方面也用了同义替换，丰富了词汇量。
Overall, compared with a balanced age group, the population in Yemen mainly consisted of younger stronger people. In the future, the relatively more stable country will witness an increasing elderly proportion.
第五段:由于前两段是分别描述两个国家的人口变化趋势，所以在结尾段中需要写出两个国家之间的对比。
饼状图必备句式
• 表示“占”：
comprise/ make up/ constitute/ account for/ take up/ occupy
consist of/ be comprised of 由…构成
consume the largest/smallest portion 占最大/最小份额
• 表示“最大”：
1. 数据作主语
The proportion of + 描述主体 is the highest.
2. 对象作主语
描述主体 + occupy/account for the major of…
描述主体 + is the largest component, which accounts for _% of all/the total/the whole.
• 表示“其次／第二大”：
1. 数据作主语
The proportion of … is the highest, followed by that of + 描述主体.
The proportion of … is the highest, with + 描述主体 following closely.
2. 对象作主语
描述主体 + is the second most + (adj.), and it takes up _% of the total.
… is the largest component, which accounts for _% of all/the total/the whole. Following closely is + 描述主体.
• 表示“最小”：
lowest percentage of +描述主体 occur at the level of
精彩句式
In Yemen, roughly a half of the population was the youngest, closely followed by the older age group people.
In five decades, by contrast, this situation is not expected to change a great deal, only that 15- to 59- year-old people will become the dominant part whereas the young is forecast to fall to a third.
On the other hand, Italian population saw less discrepancy in terms of ages, where in early 21th century 61.6% were the older adults while the other two categories were both less than a quarter.
Overall, compared with a balanced age group, the population in Yemen mainly consisted of younger stronger people.
