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
持续变化的data在不同情况下:
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 ...
最常用的两种表达法：
动词 + 副词形式
形容词 + 名词形式
1. Verb+Adverb form
The number of XXX
+increase/jump/rise/decrease/drop/fall/fluctuate...
+insignificantly/significantly/slightly/suddenly/rapidly/dramatically/sharply/steeply/steadily/gradually/slowly...
+from to / between and
2. Adjective+Noun form
There was a sudden/rapid/dramatic/significant/sharp/steep/steady/gradual/slow/slight
+increase/jump/rise/decrease/drop/fall/fluctuation
+in the number of XXX from to / between and
描述稳定的data：
The number of XXX remained steady/stable from to / between and
The number of XXX stayed the same from to / between and
There was little change / hardly any change / no change in the number of XXX from from to / between and
描述不同状态的data
Noun form:
steady drop / sharp rise peak / dramatic fall / sharp drop
Verbal form:
bottom out / reach the bottom / increase gradually / reach a plateau / remain steady
描述the highest point以及the lowest point
高点极值：
The monthly profit / The figures / The situation ...
+peaked in <准确时间点用at XXX> at XXX% / XXX
或者reached a peak / a high point at XXX% / XXX
低点极值：
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，最常用的固定搭配如下：
并列： as well as, also, as well, 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, 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 , in spite of, despite of ...
原因与结果
1. cause-suggestion
since / now that ...; I hope that...
because of/on account of/owing to/thanks to + sth, I hope that...
2. cause-effect
XXX lead to / bring about / result in/ account for ...
, therefore / thus / hence / as a result / consequently / so ...
3. effect-cause
XXX be caused by / result from / be the result of / be the effect of / be the consequence of ...
, because ...
it is adj. that ...
it is unimaginable that ...
it is undeniable that ...
it is interesting to discover that ...
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