The structure of the port related economic activities, the implication of the port economic contribution, the research methods and its its index system are discussed in this paper.

阐述了港口相关经济活动的构成、界定了港口经济贡献的内涵和组成，介绍了港口经济贡献度的研究方法及指标体系。

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This paper summarizes the economic research on the interaction between FDI and the expansion of foreign trade with normative and positive methods respectively.

关于外资流入与外贸扩张之间互动关系的经济学研究，本文主旨在于综述。且按照规范研究与实证研究方法之分野，分别进行。

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To separate cyclical trends from annual series data of GDP is not only a statistical technical problem but also related to methods to research economic operation laws.

将GDP年度序列数据中的周期趋势分离出来，不仅是一个统计技术问题，更是一个研究经济运行规律的方法问题。

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Last year, a study by the Welsh Institute of Social and Economic Research, Data and Methods (WISERD) also suggested undergraduates completing the Welsh Bacc fare less well at university than those who have not.

BBC: Welsh Bacc may be worse for university performance - study