波动：fluctuate / rebound / undulate / wave ...

　　稳定：remain stable / stabilize / level off ...

　　最常用的两种表达法：

　　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

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