上升动词类： increase, go up, rise up, grow up, jump up, surge, shoot up, keep an upward tendency 下降动词类： decrease, go down, decline, fall down, drop, sink, dip, keep a downward tendency 波动动词类： fluctuate,change 持平动词类： remain the same, stabilize, remain stable, remain constant,level off 修饰动词的副词： slightly 轻微地， slowly 缓慢地， gradually 逐渐地， steadily 稳定地， rapidly 迅速地， moderately 温和地， 轻微地， significantly 明显地， sharply 明显地， dramatically 急剧地， drastically 急剧地 上升名词类： increase, rise, growth, jump, surge 下降名词类： decrease, decline, fall, reduction, drop 波动名词类： fluctuation 修饰名词的形容词：slight, slow, gradual, steady, rapid, moderate, significant, sharp, dramatic, drastic
最高点： reach the peak/top/highest point Increase to the peak/top/highest point(所有上升类的动词都可以替换掉 increase) 最低点： reach the bottom/lowest point drop to the bottom/lowest point(所有下降类的动词都可以替换掉 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 …
Double 是两倍/大一倍 Increase/decrease three times 增长/减少了三倍
About/around + 数字 数字 + or so Approximately + 数字
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 + 形容词 + 表示趋势的名词 + in+ 变化的 主体 + 时间区间
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.