1.先(上升/下降)后(下降/上升)，之后便平稳

　　According to the data ， the years from …to…saw/winess a rise/climb/drop in the number/rate/percentage/proportion of 对象 from数据to数据，which was followed by a rapid decrease/reduce/increase over the ** years.

　　The number/rate…droped/went up again from…in ** year to…in ** year and then went up/clined gradually until ** year ，when there was a leveling off/leveling out at 数据 for 一段时间。

　　2.对峰值和低谷的描述

　　Also it can be noticed that in ** year ，the number/percentage … reached the buttom . However/on the contrary，**year saw the peak during this period.

　　……时间点 ，when the number/percentage reached(amounted to)to a peak of… / a high point at …

　　……时间点，when the number/percentage bottomed out (at…)

　　3.趋势相同描述

　　The proportion/number of 对象 in the xx and xx are similar and follow the same trend.In ** the figures were xx% and xx% respectively，rising to xx% and xx% respectively in **，after dipping to xx% and xx% respectively in **.(总体的趋势介绍)Thereafter，分开介绍即可

　　4.对未来的表述以及转换词

　　…is projected to…… as to

　　…is expected to…… as for

　　…is forcasted to …… …is estimated to…

　　5. 对波动的描述

　　as can be seen from the graph，the two curves show the flutuation of…

　　如图所示，两条曲线描述了…的波动情况。

　　……fluctuated dramatically between xx% and xx% during …period .

　　此外，在描述过程中还有很多的conjunctional words/sentences，最常用的固定搭配如下：

　　并列： as well as(句首/中)， also， as well(句尾)， either， neither， too， moreover， furthermore， in addition， additionally， besides， what’s more， apart from …

　　举例： for example， for instance， to illustrate， as an illustration， in particular，

particularly， especially

　　事实： as a matter of fact， in fact， actually， as long as， so long as …

　　雷同/近似：similarly， likewise(句首/尾)， at the same time， equally …

　　转折： however， whereas， nevertheless， nonetheless， though， although， even though，

while，yet， on the contrary， contrarily， in contrast， conversely， on the other hand，

unlikely， instead (of)， in spite of， despite of …