其次探讨了已有的相关研究的基本情况、已有研究对本研究的意义及还需要进一步研究的问题；

Secondly, through the literature review, the author discusses the research findings of the preceding researchers and the meaningful influence of these research findings on this thesis.

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但已有的相关研究，大多集中在对城乡交错带、公路或矿区周围土壤的研究上，对火电厂周围土壤重金属污染的研究较少。

While existing research mostly focused on the soils around fringes, roads or mines, there was little research on heavy metals in soils around thermal power plants.

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本文应用经济学和社会学的理论，借鉴已有的相关研究成果，构建了人力资本理论、社会资本理论对进城农民工职业选择的理论分析框架。

In this paper, the theory of economics and sociology, absorbing the relevant research results, build human capital, social capital of Migrant theory framework of career choices.

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It wasn't actually a study itself on the Mediterranean Diet, but it was a review of other studies that had been done using this statistical technique called meta-analysis.

该研究本身并不直接研究地中海式饮食法,而是运用荟萃分析的统计方法,对其它已有的相关研究进行研究

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选