雅思写作指导
图表写作：line graph曲线图，pie chart饼状图；bar chart柱状图；table表格
首段（改写）：
The ...indicates statistical data concerning about...【......描述了关于......的数据。】
The...reveals that+从句...【......显示了......。】
【the main reason why agricultural land becomes less productive改写the agricultural land becoming less productive】
【how these causes affected three regions of the world during the 1990s改写the causes of land degradation was affected by three regions in the world over the 1990s】
The pie chart indicates statistical data concerning about the agricultural land becoming less productive. The table reveals that the causes of land degradation was affected by three regions in the world over the 1990s.
中间段：比较火对比
主语+whose+名词+谓语...+rank the first place，followed by...with+数据
As can be seen from the pie chart，the over grazing whose percentage was 35% ranked the first place，followed by the deforestation with 30%.
【倍数：twice，threefold，fourfold，five times，six times】
A was ...more than B
Besides，the percentage of the over cultivation occupying 28% was fourfold more than that of the other with only 7%.
...was the largest，while+从句...
Moreover，Europe with 9.8% as for the deforestation was the largest，while North America was the smallest，accounting for just 0.2%. Furthermore，Oceania with 1.7% was 8.3% less that North America and Europe.
Additionally，there was no over cultivation in Oceania，but North America and Europe made up 3.3% and 7.7% respectively.
Also，the over grazing in North America with 1.5%，Europe with 5.5% and Oceania with 11.5 was much more than the deforestation.
....+地点+where+主语+谓语...
In terms of the total degraded dominated the different proportion in different countries where North America，Europe and Oceania separately seized 5%，23% and 13%.
结尾段：总结概括（写出最明显最突出的地方）不要出现数据的变化
To sum up，the big different causes emerged between worldwilde land degradation and land degradation by regions during 1990s.
整理
At least 150 words
The pie chart indicates statistical data concerning about the agricultural land becoming less productive. The table reveals that the causes of land degradation was affected by three regions in the world over the 1990s.
As can be seen from the pie chart，the over grazing whose percentage was 35% ranked the first place，followed by the deforestation with 30%. Besides，the percentage of the over cultivation occupying 28% was fourfold more than that of the other with only 7%.
Moreover，Europe with 9.8% as for the deforestation was the largest，while North America was the smallest，accounting for just 0.2%. Furthermore，Oceania with 1.7% was 8.3% less that North America and Europe. Additionally，there was no over cultivation in Oceania，but North America and Europe made up 3.3% and 7.7% respectively. Also，the over grazing in North America with 1.5%，Europe with 5.5% and Oceania with 11.5 was much more than the deforestation.In terms of the total degraded dominated the different proportion in different countries where North America，Europe and Oceania separately seized 5%，23% and 13%.
To sum up，the big different causes emerged between worldwilde land degradation and land degradation by regions during 1990s.
