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第一段：说明图表
开篇句：As the bar chart shows, ____ during the years of ____ to ____.
扩展句：
1、As early as _____.
2、Then _____ years later, ____.
3、And arriving in the year ____, ____.
第二段：解释图表变化原因
主题句：Several factors contribute to _____.
扩展句：
1、______. (原因1)
2、And ______.(原因2)
3、Furthermore, ______ (原因3)
4、All these result in ____.
第三段：提出解决办法
结尾句： However, ____ is faced with some problems.
扩展句：
1、With _____, ____, the effect of which is not only discouraging, but also challenging.
2、So my principle is to pay due attention to ___, but not just to ____.
