The evolvement of the theory concept of modern marketing has undergone three main periods.

现代营销理论概念演化经历了三个主要时期。

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The Economic cybernetics describes the economy by the control theory concept and the method.

所谓经济控制论，就是控制理论的概念与方法在经济学中的各种应用。

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Put forward the similar theory concept, the similar principle and the similar principle number adopted, and make the dimensional analysis.

提出相似理论的概念、相似准则及采用的相似准数，并进行量纲因次分析。

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"When Darwin first proposed his theory in eighteen fifty-nine, he had no concept of a gene, no concept of a chromosome, no concept of mutation, and certainly no concept of things like DNA and RNA."

VOA: special.2009.12.01

Another important concept in probability theory that we will use a lot is expected value, the mean, or average-- those are all roughly interchangeable concepts.

概率论中另外一个常用的重要的概念是,期望值或者也叫均值,这两个概念可以互换

耶鲁公开课 - 金融市场课程节选

But, in terms of the basic theory, that's the core concept.

但在基本原理上来说,它是核心概念

耶鲁公开课 - 金融市场课程节选

In theory the UltraViolet concept has always been a solution to the problem for digital ownership of high value content however, when requiring so many different industries to support and agree on all aspects of the specifications of such a program, it can often feel like getting nations to agree on the Kyoto Protocol.

FORBES: UltraViolet: Boom Or Bust For Studios And Consumers?

In traditional Chinese medical theory, the core concept is the qi, the vital energy that is believed to circulate throughout the body.

CNN: SPECIAL REPORT: HEALTH

"I think the concept and the theory of doing that kind of work is still a good one, " says Hess.

FORBES: As a businessman, he's been mixing with a sketchier crowd.