1、趨勢類詞匯
上升動詞類：increase，go up，rise up，grow up，jump up，surge，shoot up，keep an upward tendency
下降動詞類：decrease，go down，decline，fall down，drop，sink，dip，keep a downward tendency
波動動詞類：fluctuate
持平動詞類：remain the same，stabilize，remain stable，remain constant
修飾動詞的副詞：slightly 輕微地，slowly 緩慢地，gradually 逐漸地，steadily 穩定地，rapidly 迅速地，moderately 溫和地，輕微地，significantly 明顯地，sharply 明顯地，dramatically急劇地，drastically 急劇地
上升名詞類：increase，rise，growth，jump，surge
下降名詞類：decrease，decline，fall，reduction，drop
波動名詞類：fluctuation
修飾名詞的形容詞：slight，slow，gradual，steady，rapid，moderate，significant，sharp，dramatic，drastic
2、極值類詞匯和表達
最高點：reach the peak/top/highest point
Increase to the peak/top/highest point(所有上升類的動詞都可以替換掉increase)
最低點：reach the bottom/lowest point
drop to the bottom/lowest point(所有下降類的動詞都可以替換掉drop)
占的最多： occupy/make up/take up/account for the largest proportion/number/percentage of …
占的最少：occupy/make up/take up/account for the smallest proportion/number/percentage of …
3、倍數的表達方式
Double 是兩倍/大一倍
Increase/decrease three times 增長/減少了三倍
4、大約的表達方式
About/around + 數字
數字 + or so
Approximately + 數字
5、常用的小作文的趨勢句式表達
句式一： 變化主體/圖畫中主體+趨勢動詞+副詞+時間區間
Eg: The number of aged people over 65 increased significantly from 1940-2000.
The number of aged people over 65 dropped slightly from 1960-1980.
The number of aged people over 65 fluctuated between 1 million and 1.2 million from 1940-1950.
The number of aged people over 65 remained stable from 1930-1940.
句式二： There be + 形容詞 + 表示趨勢的名詞 + in+ 變化的主體+ 時間區間
Eg: There was an significant increase in the number of aged people over 65 from 1940-2000.
There was a slight decline in the number of aged people over 65 from 1960-1980.
There was a fluctuation between 1 million and 1.2 million from 1940-1950.
