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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 | 
