首段：描述图表引出话题　　It can be seen from the chart that there have been sharp/slight increases/decreases in the number of people travelling abroad in City X in the past decade. As the statistics shows/indicates, the year XX witnessed . However, .　　中段解释现象分析原因：There are a number of factors accounting for/responsible for the change, but the following are the most critical ones. First of all, In addition / What is more / Additionally, Last but not least, 　　末段总结提出建议：In a word / To conclude / In conclusion, this chart/pie-chart/form/table/graph/ the above statistics is a perfect indicator of what makes me convinced is that 　　近年考的较少，所以记一下开头结尾，足矣!