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You don't have to do this for Wednesday but let's say for next Monday, and that is: I'd like you to memorize a short poem by Yeats or by Frost, either one.
你们不用今天做,下星期一吧：,我想让你们背一首短诗,叶芝或者弗罗斯特的都行。
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and hit balls as well from the back of elephants, amongst other things.
是从象背上去击球，除此之外都是一样的。
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It's not going to be a backscatter event if your ping-pong ball hits the frame or these strings, or the top part.
打到原子核了就是背散射,如果打到框上。
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And, in fact there's a technique of analysis used today that's called Rutherford back scattering where people actually saw that this is a means of identifying the substance, the sample.
事实上这是现在用的一种分析技术,称作卢瑟福背散射,就是人们实际上看到的那样,这是鉴别物质样品的一种方法。
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Then she proceeds to explain that there's lacing over, on the one hand, bowling shoes laced under and lacing under, on the other hand.
于是她接着解释这是足背系带的保龄鞋，那是。
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Milton claims that his love of learning might seem to contradict the parable of the talents.
弥尔顿说这种对学习的热爱,看起来与才能的寓言是相背的。
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It is this Socrates who is brought up on charges of corruption and impiety yet none of this quite answers the question of what is the nature of Socrates' crime.
这是被控腐化,与亵渎神明的苏格拉底,但这都未能完整地回答,苏格拉底所背罪名的本质究竟为何。
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Sometimes I do, but I've got it pretty much memorized.
我有时带，不过现在差不多都背下来了。
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This is not about how you memorize things, it's about how you think.
这节课教你们怎么背东西的，这是教你如何思考的。
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They are born reciters, great memory retainers, diary keepers, letter exchangers and letter savers, history tracers and debaters, and outstaying all the rest they are just great talkers."
他们天生善背,记忆超群,爱写日记,乐于书信,尤喜收藏信件,爱追溯历史,天生的辩论家,总之他们就是很健谈"
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My back hurts. And we have a lot to wash.
我的背受伤了。我们有很多东西要洗。
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You just have the numbers that you have to remember.
只要背数字就好了。
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I have really bad luck.
我最近太背了。
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So, what I'll ask is can you stand up if you had your particle bounce back?
有13个背散射,助教们？
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You will never in this class have to memorize anything about the periodic table.
这门课并不要求大家去背元素周期表,一点都不要求。
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it looks like we were a little bit successful, I saw some backbouncing.
我看到有些球被背散射了，我们要看看有多少个。
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So, this is called back scattering.
这叫做背散射。
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We know we need to divide by 266, 266 but what we need you to help us with is to figure out this top number here and see how many particles are going to backscatter. So if the TAs can come up and quickly hand out 1 particle to everyone.
知道背散射的概率就可以了，我们知道要除以,但还需要你们来搞清楚,分子上的数是多少，有多少个发生背散射的粒子,助教们请过来,把这些球分给同学们。
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- There are a few equations that you need to memorize -- those are the very simple -- very, very simple equations, such as e equals h times nu -- hopefully you don't have to sit down and try to memorize that, hopefully we all know that already.
只有几个公式是需要记住的-,它们都非常简单，非常非常简单，比如，E，等于，h，乘以，ν,希望大家不需要再专门去背了，希望我们已经都记住了。
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So, it'll be considered a backscatter event if your ping-pong ball hits one of the nuclei.
什么情况是背散射,如果你们的乒乓球。
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And we'll ask you to imagine a few things.
这个背散射实验。
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But in our case, the probability of backscattering is going to be the number of balls that backscatter, and that's going to be divided by the total number of ping-pong balls.
用20除以132000，但现在背散射,的概率是被散射回来的小球，除以总的小球数,你们记得。
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Sam All right. So, we'll move this up to the front in just a minute, but I'm going to explain how this experiment works and we'll do the calculation first before the excitement breaks out.
好的，这是她的女儿,被背带背她在胸前，这是Patti，Christie博士，好的，我们等会,会把它移到前面,但我要先解释下。
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