一．数据类图表
1.1 Pie chart(圆形图/饼状图/圆面分割图 )   它是比较形象和直观的一种图形，此图形反映的是整体与部分的关系，整个圆表示总量，楔形块表示分量。有时圆形图还有数值表，两者结合可把各分量表示得更准确、清楚。    通常以百分数的形式表现出来，所以描写重点是图中的比例构成和最具特点的扇面。描写的时候注意最大或最小的扇面，对于各扇面数据的描写最好以从大到小的顺序来进行。　This is a pie chart of the average weekly expenditure of a family in Great Britain. As can be see from the chart, the main expenditure of an average British family is spent on food, which accounts for 25% of its total expenditure. The next two significant expending items are transport and housing, wh ...