collapse；to decline；to drop；
b. 可以使用的名词：
a collapse；a decrease；a fall；a decline；a drop
图表作文-第一段 图表描述
表示程度的副词：
1. 程度较大：
considerably；dramatically；greatly；markedly；obviously；quickly；rapidly sharply；significantly；suddenly 2. 程度较小：
slightly；gradually；slowly；steadily
图表作文-第一段 图表描述表示程度的副词：
1. 程度较大：
considerably；dramatically；greatly；
markedly；obviously；quickly；rapidly sharply；significantly；suddenly 2. 程度较小：
slightly；gradually；slowly；steadily
图表作文-第一段 图表描述
1. 表示相似的句型 (实例) ：
Both share prices rose sharply in January.
Neither company has made a profit yet.
Like X, Y fell in June.
X rose just as sharply as Y. 2. 表示差异的句型（实例）： X fell sharply whereas/while Y remained steady.
X fell quickly compared to Y. Unlike Y, X rose by 10%.
X rose far more dramatically than Y.
图表作文-第二段 解释原因
1. 主题句
主题句通常表达引起这种变化的原因有几点.例如:
(1) There are many factors that have stimulated this huge change. (2) Such changes are mainly caused by two reasons.
图表作文-第二段 解释原因主观：I/We believe that three reasons can account for this phenomenon.
主观之变体（使用插入语，突显主语）： Three reasons, I/we believe, can account for this phenomenon.
Three reasons, I firmly believe, can account for this phenomenon.
（注意插入语属于看似平淡却极富功力的技巧）
客观：Several reasons can account for this phenomenon.
图表作文-第二段 解释原因 2. 展开讨论
下面可以使用连接词来分两个、三个或四个方面来写了，其中分三个方面来写是最常见的——可以由最重要的到最不重要的，也可以由最不重要的到最重要的，也可能平行分布，主要依情况而定，不一而足。
当然也有一种情况，就是完全不使用连接词——也就是说用语义而非词汇的手段来组织全段——这需要很强的逻辑联系。
图表作文-第二段 解释原因下面选自一篇讲旅游的文章：
Although we are happy to see the tourism industry is flourishing and on the rise, the potential drawbacks can never be neglected. The neighboring environment is decaying
around some places of interest mainly because tourists throw garbage here and there. Sometimes the overall view is spoiled by buildings which are awkward and out of place. Tourists’ flooding into an area may
fundamentally change the living mode of local inhabitants, causing serious culture problems.
图表作文-第三段第三段的情况比较复杂：
这一段直接就进入结论部分的情况越来越少了；
如果这篇文章讲的是一个令人担忧的问题，那么这一段很可能是谈解决办法；
如果这篇文章讲的是一个好的变化，那么这一段很可能是写未来趋势或发展方向。
图表作文-结尾