16.this is a graph which illustrates... 这个图表向我们展示了...
17.this table shows the changing proportion of a & b from...to... 该表格描述了...年到...年间a与b的比例关系。
18.the graph, presented in a pie chart, shows the general trend in... 该图以圆形图形式描述了...总的趋势。
19.this is a column chart showing... 这是个柱型图，描述了...
20.as can be seen from the graph, the two curves show the fluctuation of... 如图所示，两条曲线描述了...的波动情况。
