Okay now we're going to talk about one-group diffusion theory and we're going to explain a bit about why we call it diffusion theory.

好了现在，我们要谈论单群，扩散理论，我们要解释一下，为什么我们称它为扩散理论。

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An analysis of highly-enriched uranium-heavy water lattice was made recently using few-group diffusion theory and the equivalent diffusion of control rods and target assemblies.

利用少群扩散理论和控制棒与靶件的等效扩散处理方法进行了高浓铀-重水栅的分析计算。

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You then can a multi-group either diffusion equation or solve these types of equations and more rigorously.

然后你有一个多群的或者是扩散等式,或者更严厉地解决这些等式。

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"Chalk it up to effective marketing, " said Michael Greeson, president of the Diffusion Group, of Apple's green reputation.

WSJ: How Green Is Apple?

The early forecast by The Diffusion Group (TDG) is an indication that podcasting has captured the imagination of digital music player owners who demand to listen to more than just music.

BBC: NEWS | Technology | Podcasting set for 'huge growth'