总述：It is explicit that the (图表类型) demonstrates (图表名称).
图表类型： line chart/graph, column chart, pie chart, table.
静态比例图：We can see from the chart that (项目1) has the highest percentage, constituting ___%, followed by (项目2) which represents ___%. (项目3) and (项目4) occupy ___% and ___% respectively.
单因素变化：As is reflected by the diagram, the volume/number was (起始数字) in (起始年份), compared with (终止数字) in (终止年份), showing a slight/dramatic increase/decrease of (总差额).
多因素变化：There was a considerable/slight increase/decrease in (描述对象1) from (起点数字) in (起点时间) to (终点数字) in (时间). During the period, there was a marked jump from (起点数字) to (终点数字) in (描述对象2), while that of (描述对象3) declined significantly from (起点数字) to (终点数字).
引出观点(单因素变化或静态图)：From my perspective, there are several fundamental factors contributing to the aforementioned phenomenon could be summarized as follows.
Primarily, ... Moreover, ... Finally, ...
引出观点(多因素变化)：The data reflects a shift in (人群) view regarding (某领域).
On the one hand, ... On the other hand, ... Meanwhile, ...
个人原因：(连接词), through (方式), people have the opportunity to (做某事), thus living a more fulfilling and promising life wherever they are.
经济原因：(连接词), with the prosperity of economic and increase of individuals’ income, people now can (做某事).
社会原因：(连接词), with the quickening pace of modern life and the fierce competition of society, people’s values have changed to (做某事) in order to (达到什么目的) gradually.
政策原因：(连接词), relevant policies issued by authorities make the way for (某事).
给出结论：In a nutshell, (简短的给出结论).
趋势不好则给出建议：It’s suggested that government should enact legislation in order to (改变某事).
趋势良好则给出预测：It can be predicted that as (影响因素) develops, (主题词) will be more (发展趋势)。