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So we can think about now doing bonding, and now we have four equal orbitals with one electronic each.
我们现在可以考虑成键了，现在我们有4个等价的轨道，每个上面有1个电子。
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because this is the four years in our lives that we really do have this unique experience.
因为这是我们生命中的四年时光，而我们真的应该拥有这样的独特经历。
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So we can have four total hydrogens bonding here, - and we can think about how to describe these carbon- carbon bonds.
我们这里一共有四个氢原子成键，我们可以考虑怎么来-,描述碳碳键。
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It's about the four-dollar cup of coffee that we have three times a day, because we need to keep the feel going.
可能只是节省一杯4美元的咖啡,我们每天要喝三次咖啡，只是为了留住这种感觉。
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Four years later, as of today, 76% I think we have about 76% of the Chinese search traffic.
而四年之后的今天，这个数据已经上升到。
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In the next line four lines, we have Camus; the god of the river Cam appears.
下面四行，开姆斯;,开姆河河神出现了。
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But for now all you need to know is - that these four different kingdoms-- one was where we now have Greece, another one was where Syria is, another was Egypt, and then there was another further north, but that's not as important for us.
不过目前你们只需要知道,这四个不同的王国-,一个是当今的希腊，一个是当今的叙利亚，一个是埃及，还有一个在更北面的地方，不过对我们来说不是很重要。
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Now going from three to four right, so we have another isothermal process for an ideal gas, so I won't try to make you sing again so soon.
从第三点到第四点，这也是一个理想气体的,恒温过程，这次不用你们集体回答了。
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We have the convention of music of writing this symbol indicating the beat-carrying unit of four so I'm writing a four underneath each of these.
我们有一个约定俗成的书写格式,来表示四拍一单元,所以我在每行这里的下面写上一个四
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We have probably four great reform periods in American history.
我们美国历史上约有四个大改革时期
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At the moment we have been assigned four TAs, though looking around we won't need four TAs, but at the moment we have Da-Ihn Yoo, we have Michael Verriman, we have Andrey Ivanov, and we have Brian Reilly.
目前给我们安排了四个助教,虽然我觉得用不了四个,不过我们目前还是有余大有,和迈克尔·韦里曼和安德烈·伊凡诺夫,还有布莱恩·莱利
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What have we done over the last three or four lectures? We've started introducing you to classes of algorithms. Things that I'd like you to be able to see are how to do some simple complexity analysis.
我们在过去三节或四节课中讲了什么？,我开始向你们,介绍算法的类型,我想你们知道的是,如何做一些简单的复杂度分析。
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I love the fact that we have to train for four or five months,
我们要训练四五个月，我挺喜欢这样的。
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So we have course one through twenty-four, although a few numbers are missing.
我们把课程从1到24进行了编号；虽然有几个号码缺失了。
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We have one, two, we have four bonding domains.
我们发现一共生成了1，2，3，4根键。
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I have no idea what's here at the moment so I'm just going to draw a question mark because that memory might have been used previously for some other purpose, but we know it's currently available to us so we have four bytes of memory.
我不知道在此刻这里是什么,所以我画一个问号，因为那块内存可能在之前,为其它的目的而使用过，但是我们知道它可以为我们所使用,这样我们就有4个字节的内存。
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Let's say there was four times as much Venture Capital, would we have four times as much innovation? I don't think so.
比如说，投入资金达到了风险资本的四倍，就会有四倍的创新思维吗？，并不是这样。
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Have we got four?
我们有四个人吗
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They want to get as far away from each other possible, the ideal angle is 120. But what we have here is a four-membered ring, so what angle does 90° that have to be, that bond? 90 degrees.
它们想要尽量远离彼此，最理想的是形成120°键角,但现在是个四元环,所以这键角应该多大？
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That makes sense because we know that every single electron has to have its own distinct set of four quantum numbers, the only way that we can do that is to have a maximum of two spins in any single orbital or two electrons per orbital.
那个讲得通,因为我们知道每一个电子,都有它自己独特的量子数,我们能做的唯一方式是,在任一单个轨道中最多有两个自旋电子,或者每个轨道有两个电子。
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So now what we have is four bonds.
现在我们有4个键。
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So in addition to having these two carbon bonds, we actually also have four carbon hydrogen bonds in addition to our carbon-carbon bonds.
在这碳碳之间的键以外，我们还有四个碳氢键,除了我们的碳碳键外。
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Then we're going to have another isothermal step, a compression to some point four.
然后有另外一个绝热过程，绝热压缩到4点。
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So we have four choices in terms of initial and final energy levels, and also what it means - in terms of the electron -- whether it's gaining energy or whether it's going to be emitting energy?
我们有这四个选项,各有不同的初始能量和末能量,它都是按照电子来说的,不管是失去能量还是得到能量？
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We have some students who enter on an athletic team and stay all four years with that team.
有些学生是因为体育特长,而被录取，而且大学四年,仍然从事那项体育活动。
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