data在某一個時間段固定不變：fixed in time

　　在一系列的時間段中轉變：changes over time

　　持續變化的data在不同情況下:

　　增加：increase / raise / rise / go up ...

　　減少：decrease / grow down / drop / fall ...

　　波動：fluctuate / rebound / undulate / wave ...

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

　　最常用的兩種表達法：

　　動詞 + 副詞形式

　　形容詞 + 名詞形式

　　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

　　描述穩定的data：

　　The number of XXX remained steady/stable from to / between and

　　The number of XXX stayed the same from to / between and