data在某一个时间段固定不变：fixed in time
在一系列的时间段中转变：changes over time
增加：increase / raise / rise / go up ...
减少：decrease / grow down / drop / fall ...
波动：fluctuate / rebound / undulate / wave ...
稳定：remain stable / stabilize / level off ...
动词 + 副词形式（Verb + Adverb form）
形容词 + 名词形式（Adjective + Noun form）
1. Verb + Adverb form
The number of XXX
+from (时间) to (第二时间) / between (时间) and (第二时间)
2. Adjective + Noun form
There was +
+in the number of XXX from (时间) to (第二时间) / between (时间) and (第二时间)
The number of XXX remained steady/stable from (时间) to (第二时间) / between (时间) and (第二时间)
The number of XXX stayed the same from (时间) to (第二时间) / between (时间) and (第二时间)
There was little change / hardly any change / no change in the number of XXX from (时间) to (第二时间) / between (时间) and (第二时间)
steady drop / sharp rise peak / dramatic fall / sharp drop
(to) bottom out / (to) reach the bottom / (to) increase gradually / (to) reach a plateau / (to) remain steady
描述the highest point以及the lowest point:
The monthly profit / The figures / The situation ...
+peaked in (月份/年) <准确时间点用at XXX> at XXX% / XXX(极点data)
或者reached a peak / a high point at XXX% / XXX(极点data)
XXX bottomed out / reached
+rock / the bottom / a low point
或者hit a trough
此外，在描述过程中还有很多的conjunctional words/sentences, 朗阁海外考试研究中心总结出*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, in stead (of), in spite of, despite of ...
1. cause-suggestion (几乎不常用)
since / now that ...; I hope that...
because of/on account of/owing to/thanks to + (doing) sth, I hope that...
2. cause-effect (较常用)
XXX lead to / bring about / result in/ account for ...
(一个句子), therefore / thus / hence / as a result / consequently / (and) so ...
3. effect-cause (较常用)
XXX be caused by / result from / be the result of / be the effect of / be the consequence of ...
(一个句子), because ...
it is adj. that ...
it is unimaginable that ...
it is undeniable that ...
it is interesting to discover that ...
图表类型：table; chart; diagram; graph; column chart; pie graph
描述：show; describe; illustrate; can be seen from; clear; apparent; reveal; represent
内容：figure; statistic; number; percentage; proportion
一般：have 10%; at 10%; over 10%
*（低）点：peaked; reached a peak / high point
bottomed out; reached the bottom
变化：recover 略有回升；increase; jump; rise/rose; climb
decrease; fall/fell; drop; decline; reduce
remained steady/stable; stay the same; little/hardly any /no change
表示范围：from XXX to XXX; between XXX and XXX; for XXX to XXX多长时间直