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 (时间) to (第二时间) / between (时间) and (第二时间)
描述稳定的data：
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 from (时间) to (第二时间) / between (时间) and (第二时间)
描述不同状态的data
Noun form:
steady drop / sharp rise peak / dramatic fall / sharp drop
Verbal form:
(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
高点极值：
The monthly prof it / 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)
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(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)