(1)描写曲线走势的常用句型。曲线的走势可用上升、下降、保持平稳、有所波动等用语来描述：
Before 1970 the birth rate remained level. Then in 1970 it fell till it reached 30 per thousand.
The birth rate in this region rocketed to the highest peak in 1963.
Although prices fluctuated between 1962 and 1972， overall the trend was downward.
The economy went up and down in a zigzag way.
After a steady decline for a whole decade the country’s fertility rate shows signs of leveling off.
(2)描述图表常用的概括性句型
这种句子通常用于文章或段落的开头和结尾：
This table provides several interesting points of comparison between A and B.
The two graphs depict the same thing seen in two different ways. The first diagram simply records… The second graph throws a new light on…
The key findings taken from the surveys are as follows：…
If drivers continue to drive more carefully and further strengthen their sense of safety， the rate of accidents can be expected to decline even more dramatically in the year 1991.
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