七分学弟线图先读时间、单位和对象，再找整体变化。概述写主要走势和最显著的关系，细节段用数字说明，避免逐年念出所有数据。
概述与细节怎样分工
两条线都上涨，可以概述共同趋势，同时指出哪个组增长更明显。细节段再选起点、终点和关键转折。不是每个时间点都需要单独一句。
数字与单位如何对应
从 10% 到 20% 是增加 10 个百分点，不能写成增加 10%。比例图不能直接证明总人数变化。没有原因信息时，不要把趋势解释成政策或人口增长的结果。
示范题
A practice line graph shows the percentage of commuters cycling in Northbridge and Southbridge. In 2015, 2020 and 2025, the figures were 10%, 15% and 25% for Northbridge, and 20%, 22% and 24% for Southbridge. Summarise the information and make comparisons where relevant.
示范段落
Overall, cycling became more common in both towns, but the increase was considerably larger in Northbridge. Its figure rose from 10% in 2015 to 25% in 2025, while Southbridge recorded a smaller rise from 20% to 24%. Northbridge therefore moved from the lower starting point to a slightly higher final proportion.
怎样检查这一段
先遮住示范段落，用自己的话解释每句话的作用。再换一个细节重写，检查判断和依据是否仍然对应。不要只替换同义词；如果意思变了，要同时改理由。
接着练习
先读 训练流程，再安排读图和比较练习。