文档介绍：line graph
line graph
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小作文其实很好写，但是写好总是不容易。其实道理很简单，是因为我们用汉语描述小作文图形特征还不是很专业，更不熟练。所以请先整理好汉语作文之后，再应用我们学过的表达写小作文。效果一定会不一样的。
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基本规则：
1 文本采用过去时
2 切勿将数据写错
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正文内容：
1 抓住图表内轴线的趋向
2 对轴线进行比较说明
3 尽量具有强烈的可比性
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核心常用词汇：
1 同义转换
2 选择重点
3 搭配速度与程度表达
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The line graph compares average yearly spending by Americans on mobile and landline phone services from 2001 to 2010.
概括线图内容
　
It is clear that spending on landline phones fell steadily over the 10-year period, while mobile phone expenditure rose quickly. The year 2006 marks the point at which expenditure on mobile services overtook that for residential phone services.
总述一条线总体趋势，和另一条行程对比
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In 2001, US consumers spent an average of nearly $700 on residential phone services, compared to only around $200 on cell phone services. Over the following five years, average yearly spending on landlines dropped by nearly $200. By contrast, expenditure on mobiles rose by approximately $300.
自2001年开始，描述cell phone每一段的变化趋势。
In the year 2006, the average American paid out the same amount of money on both types of phone service, spending just over $500 on each. By 2010, expenditure on mobile phones had reached around $750, while the figure for spending on residential services had fallen to just over half this amount.
对比手机服务，写出手机服务的特征。对另一条线进行系统描述。
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在运动范畴中存在着如下的8种运动趋向：
：我们可以使用的套用结构有：stay stable/remain steady.
举例：表示人口数量保持平稳的时候可以写：The number of population stayed stable./The number of population remained steady.
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