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...
该图以饼图形式描述了...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。
