( 四 ) 图表式作文

It is obvious in the graph/table that the rate/number/amount of Y has undergone dramatic changes. It has gone up/grown/fallen/dropped considerably in recent years (as X varies). At the point of (接近)X1, Y reaches its peak value of … (多少).

What is the reason for this change? Mainly there are … (多少) reasons behind the situation reflected in the graphic/table. First of all, … (第一个原因). More importantly, … (第二个原因).Most important of all, … (第三个原因).

From the above discussions, we have enough reason to predict what will happen in the near future. The trend described in the graph/table will continue for quite a long time (if necessary measures are not taken 括号里的使用于那些不太好的变化趋势).