Welfare economics was regard as a theoretical foundation of the CEA.In the practice, both welfare economics and extra-welfare economics became the guidance of the CEA.是什么意思_Welfare economics was regard as a theoretical foundation of the CEA.In the practice, both welfare economics and extra-welfare economics became the guidance of the CEA.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句