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So, that's the kind of stuff: a little bit of background about myself. So now, 1 let's talk about the perspective of 3.091 All of this will be posted. You can take notes.
就是这些事情，我自己的,一点背景介绍，现在，我们谈谈这门课程的远景1,这些都会放到网站上去，你们可以记笔记。
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This, I think Chapter 3, describes fairly well the things we'll talk about today.
这个,我认为第三章,为我今天要讲的内容做了很好的讲解
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And we will talk about that later in 3.091.
之后我们会在在本课程中谈论到。
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So, let's have you try one more, if we can switch over and talk about a 3 d orbital.
让我们再来看一个，转到课堂题目上去,我们来看看3d轨道。
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Next week we're going to talk about genes and genetic engineering, that's Chapter 3.
下周我们会讨论基因和基因工程,就是第三课的内容了
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And we'll talk about that and that's what Chapter 3 is about.
我们会在学习第三章时做进一步介绍
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This week we're going to talk about DNA technology and genetic engineering: this is Chapter 3 of the book.
这星期我们将探讨DNA技术,和基因工程,这是本书第三章的内容
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And when we make these comparisons, one thing I want to point out is that we need to keep the constant principle quantum number constant, so we're talking about a certain state, so we could talk about the n equals 2 state, or the n equals 3 state.
当我们做这些比较时，我想指出的一件事是,我们需要保持常量原则,保持量子数是常数，所以我们在讨论一个确定的态时，我们可以谈论n等于2的态，或者n等于3的态。
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