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1、趋势类词汇

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

持平动词类： remain the same, stabilize, remain stable, remain constant

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

2、极值类词汇和表达

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 …

延伸阅读：

掌握科学有效的词汇学习方法

雅思写作各类词汇要求

写好雅思作文的5点建议

更多阅读资料：
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