4、大约的表达方式
About/around+数字
数字+orso
Approximately+数字
5、常用的小作文的趋势句式表达
句式一：变化主体/图画中主体+趋势动词+副词+时间区间
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 o faged 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
