首先对国内外的研究作了一番回顾，并对重点概念作了相应界定。

The research was to look back firstly, and made a corresponding definition of key concepts.

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本文首先对文中的重点概念进行了界定，梳理和总结了相关的理论，综述了国内外的研究成果，在此基础上展开研究。

Firstly, define the important concepts in the study, collate and summarize the relevant theory, review the research results at home and abroad which as the basis of this research.

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但是，本月关注的重点概念是迭代（iteration），因为迭代器在 Groovy 对 JDBC 的增强中扮演着重要角色。

The most important concept to focus on this month, however, is iteration, because iterators play an important role in Groovy's enhancement of JDBC.

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See, to be honest even though it might feel like a whole of new stuff at once, it's a pretty small language and so we've almost seen all of the syntactic features thus far so now we'll be able to start focusing more on concepts.

瞧，即使它感觉好像一个新的东西,它是一种相当小的语言,我们迄今看到的几乎所有的语法特征,现在我们将把重点放在概念上。

哈佛公开课 - 计算机科学课程节选

Another concept that's important in thinking about stem cells is potential.

另一个需要重点考虑的概念,就是干细胞的潜能

耶鲁公开课 - 生物医学工程探索课程节选

I just want--one point of this lecture is to try to emphasize the real breadth of the concepts of finance and how important they are-- how they reach out into other things that you might not think as associated with finance.

我想要。。。这节课的一个重点是,要强调金融的广义概念,以及它的重要性-,它们如何影响其他事物,你可能认为它们根本跟金融没有联系。

耶鲁公开课 - 金融市场课程节选