By referring to foreign research methods, I tried to apply the portfolio theory to the study of macroeconomic growth in China.

因此笔者在参照国外学者的研究方法基础上，试图应用资产组合理论对中国宏观经济增长进行初步的研究。

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This study adopts three research methods, i. e. literature review, questionnaire, and case study and carries out a case study on Wuxi No. 6 Senior High School.

本研究采用文献法、问卷调查法、个案研究法，以无锡市第六高级中学为个案进行研究。

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In the research I conducted I surveyed methods and data in use in national statistical offices in sub-Saharan Africa.

CNN: Is Africa much richer than we think? No one knows