Task 1：概览句

IELTS band descriptors for Task 1 mention one feature by name: the overview. An overview is one or two sentences that state the main pattern of the whole chart — what goes up, what goes down, what dominates — without quoting any specific figures. A response with accurate details but no overview is capped at band 6 for Task Achievement, while a clear overview is the single fastest route to band 7. The overview usually starts with a signpost word such as 'Overall,' and answers one question: if a reader saw nothing but your sentence, would they know the chart's story?

雅思 Task 1 的评分标准中点名提到一个要素：概览（overview）。概览是一到两句话，概括整张图表的主要模式——什么在上升、什么在下降、什么占主导——并且不引用任何具体数字。细节准确但没有概览的作文，任务完成度最高只能拿 6 分；而一个清晰的概览是通往 7 分最快的路径。 概览通常以 'Overall,' 这样的路标词开头，并且只回答一个问题：如果读者只看你这一句话，能否知道图表讲了什么故事？

To find the overview, ignore individual bars and points. Ask three questions in order: (1) What is the overall direction — rising, falling, or stable? (2) Which category is highest or lowest for most of the period? (3) Is there a crossover — a moment where two lines swap positions? Any two of these answers, joined in one sentence, make a complete overview. Two common mistakes to avoid: copying a number into the overview ('rose to 45%') — numbers belong in the detail paragraphs — and listing every category one by one, which is description, not overview.

要找出概览，先忽略单个柱形和数据点。按顺序问三个问题：（1）总体方向是什么——上升、下降还是平稳？（2）在大部分时间里，哪个类别最高或最低？（3）有没有交叉点——两条线互换位置的时刻？任选其中两个答案，合成一句话，就是一个完整的概览。 要避免两个常见错误：把数字写进概览（'rose to 45%'）——数字属于细节段；以及把每个类别逐一罗列，那是描述，不是概览。