Main view: As any rational person may see at their first thought, a decent house can not just have a decent decoration, but also a firm inner structure, which would be even more important .
从理性的角度来看，我们显然可以知道，结构的部分会更加重要，可是也不可以忽略外部的修饰。
Various economic schools have given their reasons why business cycles appear from many aspects, which include inner and outer causes, aggregate supply and demand etc.
对于经济周期波动现象出现的原因，各个经济学流派从不同角度进行了阐释。
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