Growth can be represented by a linear or log linear trend.

增长可以用线性或对数线性趋势来表示。

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Although the growth of an economy is linear but it is noticed that the economy trend is like a roller-coaster, reaching a pinnacle and dipping down to the trough.

尽管经济的增长是线性的但是我们可以观察到，经济趋势就像过山车，到达顶峰后，突然降到谷底。

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