凯恩斯经济理论的基础是有效需求理论，国家干预理论是其经济理论最核心的内容。
Effective demand theory is the basis of Keynesian economic theory, the theory of state intervention is the core content of his economic theory.
在这样的大背景下，循环经济理论应运而生，并日益受到许多国家和地区的广泛重视。
The theory of the cyclic economy comes into being under this background, and has drawn much attention in many countries.
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