日期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：change over time
持续变化的data 在不同情况下：
增加：increase, rise, grow, go up, appreciate..。
减少：decrease, fall, drop, go down, decline,.。
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(Verb + Adverb form)
形容词 + 名词形式(Adjective + Noun form)
1、Verb + Adverb form
The number of XXX +increase/ jump/ rise/ decrease/ drop/ fall/ fluctuate ... +insignificantly/ significantly/ slightly/ suddenly/ rapidly/ dramatically/ sharply/ steeply/ steeply/ steadily/ gradually/ slowly ...+from (第一时间) to (第二时间) / between (第一时间) and (第二时间)
2、Adjective + Noun form
There was a (very) sudden/ rapid/ dramatic/ significant/ sharp/ steep/ steady/ gradual/ slow/ slight +increase/ jump/ rise/ decrease/ drop/ fall/ fluctuation (注意：上述很多词不可用于修饰fluctuation) +in the number of XXX from (第一时间) to (第二时间) / between (第一时间) and (第二时间)
3、描述稳定的日期：
The number of XXX remained steady/ stable from (第一时间) to (第二时间) / between (第一时间) and (第二时间)
The number of XXX stayed the same from (第一时间) to (第二时间) / between (第一时间) and (第二时间)
There was little change/ hardly any change/ no change in the number of XXX from (第一时间) to (第二时间) / between (第一时间) and (第二时间)
4、描述高点值以及低点值
高点值：
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reach a peak/ a high point at XXX% / XXX (极点data)
低点值：
XXX bottom out/ reach +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 (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..。
原因与结果：
(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..。
ause-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..。
ffect-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..。
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