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    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
　　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.