雅思写作 Task 1 或托福综合写作里，如果只会用 increase / decrease，词汇分会受限。这组精准同义替换，能让表达层次感立刻提升。
表示激增
- surge（急剧上升，强调速度与幅度）
Mobile payment adoption surged by 60% within two years.
- proliferate（迅速扩散、大量涌现）
AI-powered applications have proliferated across all industries.
表示下降
- plummet（暴跌，幅度大且速度快）
The cost of renewable energy has plummeted over the past decade.
- dwindle（逐渐减少至微量，过程缓慢）
Traditional bookstores are dwindling in number nationwide.
表示平稳
- plateau（达到峰值后趋于平稳，不再增长）
User growth has plateaued after the initial launch phase.
综合练习（一句话串联三种趋势）
While smartphone adoption surged in emerging markets, desktop sales plummeted, and tablet demand plateaued in developed economies.
记忆技巧：把词汇嵌入真实语境句子里反复朗读，比背单词表高效 3 倍。下次写作时，有意识地替换掉 increase / decrease，考官一定会注意到！
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