31.there is not a great deal of difference between...and...

　　...与...的区别不大。

　　32.the graphs show a threefold increase in the number of...

　　该图表表明...的数目增长了三倍。

　　33....decreased year by year while...increased steadily.

　　...逐年减少，而...逐步上升。

　　34.the situation reached a peak(a high point at) of[%].

　　...的情况(局势)到达顶(高)点，为...百分点。

　　35.the figures/situation bottomed out in...

　　数字(情况)在...达到底部。

　　36.the figures reached the bottom/a low point/hit a trough.

　　数字(情况)达到底部(低谷)。

　　37.a is ...times as much/many as b.

　　a是b的...倍。

　　38.a increased by...

　　a增长了...

　　39.a increased to...

　　a增长到...

　　40.high/low/great/small/ percentage.

　　比低高(低)

　　41.there is an upward trend in the number of...

　　...数字呈上升趋势。

　　42.a considerable increase/decrease occurred from...to...

　　...到...发生急剧上升。

　　43.from...to...the rate of decrease slow down.

　　从...到...，下降速率减慢。

　　44.from this year on，there was a gradual declinel reduction in the...,reaching a figure of...

　　从这年起，...逐渐下降至...

　　45.be similar to...

　　与...相似

　　46.be the same as...

　　与...相同

　　47.there are a lot similarities/differences between...and...

　　...与...之间有许多相似(不同)之处

　　48.a has something in common with b

　　a于b有共同之处。

　　49.the difference between a and b lies in...

　　a与b之间的差别在于...

　　50...(year)witnessed/saw a sharp rise in...

　　...年...急剧上升

　　当然并不是背熟了这些句子就一定会得高分，图表作文的篇章布局和逻辑结构也很重要。所以如果条件允许，建议大家参加雅思写作辅导班，有经验的老师会教你如何写，并帮你修改，这样的话提高就会很快。