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"We're talking about farmers who are losing their crops; we're talking about people who are having to learn to live with more frequent drought and floods.
VOA: standard.2009.11.06
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So, if we have a high intensity, we're talking about having more photons per second, and it's important to know also what that does not mean.
所以，如果我们有一个高强度，我们就是在讨论每秒钟,有更多的光子数，同样理解它不代表什么,也是很重要的。
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So you're basically having a wave equation for a particle, and for our purposes we're talking about a very particular particle. What we're interested in is the electron.
所以你们主要有,一个粒子的波动方程，我们的目的是考虑一个特殊的粒子,我们感兴趣的是电子。
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I have an ad i'll show you later in the class for Honey Nut Cheerios where people are talking about how they're having to suffer by eating Honey Nut Cheerios to lower their cholesterol level.
健康宣示:美国食品药品管理局认可并允许的对某种食品促进健康能力的公开宣传 我有一个广告,一会儿会给大家演示,关于坚果甜麦片,这种常被人们谈及的食品,如何通过,吃坚果甜麦片,来降低胆固醇含量
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So, instead of having the periodic variation of water, or the periodic variation of air density here we're talking about an electric field.
不像水或者空气密度的,周期变化，我们这里,讨论的是电场。
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All right, so let's think of a more complicated example of having a double bond, and maybe a more interesting example, and this is talking about benzene.
好了，让我们来看关于双键的,一个更复杂的例子，也许是更有趣的例子，我们要讨论苯环。
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So, we're going to start with talking about bonding, and any time we have a chemical bond, basically what we're talking about is having two atoms where the arrangement of their nuclei and their electrons are such that the bonded atoms results in a lower energythan for the separate atoms.
那么，下面我们将从成键开始讲起，无论什么时候我们有一个化学键，基本上我们所讨论的,都是如何安排两个原子的原子核的位置,与电子的位置使得成键的两个原子,最终比分开时的能量更低。
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In contrast, if we talk about a double bond, what we're now talking about is having both a sigma bond and also one pi bond. And I apologize, I intended to set this up right before class, but that didn't happen today.
相反，如果我们讨论一个双键，我们现在讨论的是,一个sigma键和π键，抱歉，我应该在课前就把这个装好的，今天没装好。
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