2)变量幅度词语

　　 增加-----increase, jump ,go up ,rise, climb , ascend , level up ,surge,

　　 减少----decrease, drop ,go down ,fall,---- , descend, level down ,

　　 水平----keep/stay/remain/maintain stable ,----steady ,be similar to ,there is little/hardly any/no change

　　 最高-----reach a highest point/the top/the summit/the peak/the most/peak in,at

　　 最低-----reach a lowest point/the bottom//rock/hit a trough /bottom out

　　 交叉-----correspond with in ----year; --- crossing the line for -----

　　3) 时间幅度词语

　　During the period 19701999 ; From 1970 to 1999 ; Since the early 1970s ;

　　In 1970------then in 1980-----ten years later

　　4)基本句型

　　There was变化趋势in the number of A from 1986-1990 ,which was followed by 变化趋势and then变化趋势 until 1998 when there was变化趋势 for the next .years

　　From 1990 onwards, there was变化趋势 in the number of A which then 变化趋势 at $% in 1994.

　　In 1990,the number reached $%,but 30 years later there was变化趋势.

　　After 变化趋势 fromto ,A begin 变化趋势 over the next.years.

　　The number of increased rapidly from 1988 to 1990 during the five-year period

　　There was a rapid increase from 1988 to 1990 during the five-year period

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