I left out the noble gases here because they do something a little bit special, and actually, I'm going to give you one last clicker question today to see if you can tell me what you think noble gases do.

我并没有把稀有气体算在里面,因为它们的电子亲和能有点特别，实际上，我将会把这作为今天的,最后一个选择题，来请大家告诉我,你们觉得稀有气体电子亲和能应该是怎样的。

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With those warnings, let me tell you sort of what I think most people think about this.

这些是你们要注意的,我来说说当今社会上的主流观点

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But for those of you who raised your hand just tell me I mean why do you think--what makes you believe food can be addictive?

但那些举手的同学,请你们告诉我,你为什么觉得食物会上瘾呢

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I think you can tell by analogy with what I did in one dimension that the position of that object at any time t is going to be the initial position plus velocity times t plus one half a t square.

你们可以类比一下我在一维情况下的结论,这个物体在任意时刻 t 的位移,等于初始位移,加上 v ? t + 1/2 ? a ? t^2

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