或 From above, we can predict that 预测.
原因分析式
It is obvious in the graphic/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 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 graphic/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).
(整理)
万能英语作文模版
（I）说明原因型
模块（一）
Nowadays ,there are more and more XX in some big cities . It is estimated that(1).
Why have there been so many XX ? Maybe the reasons can be listed as follows.The first one is that (2).Besides,(3). The third reason is (4).To sum up, the main cause of XX is due to (5).It is high time that something were done upon it. For one thing,(6).On the other hand ,(7). All these measures will certainly reduce the number of XX .
注释：
（1）用具体数据说明XX现象
（2）原因一
（3）原因二
（4）原因三
（5）指出主要原因
（6）解决建议一
（7）解决建议二