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So let's have a clicker question here on how many total pi bonds do you expect to see in benzene?
让我们来做个课堂习题,你们觉得苯环里有一共多少个π键？
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And this one will be particularly germane to a portion of Problem Set 1, at least in Problem Set 1.
这个程序跟习题集1中的,一部分比较相似，至少在习题1中。
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You know, we've done a bunch of thermochemistry, and we've kind of seen that the energy of mixing, your energetics don't change too much as a function of temperature.
我们做过很多的化学热力学习题，某种程度上我们发现混合的能量，并不随着能量,发生大的改变。
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There may be some simple problem involving this in the problem I assigned, so I am just going over this.
在我布置的作业里可能有,相关的简单习题,所以我要讲讲这部分内容
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But remember that you do have recitation on Tuesday, so that could be very helpful with the problem-set, so be sure to go to recitation on Tuesday, and have a great long weekend.
记住，周二有习题课，这对做课后题很有帮助，所以周二一定要来上习题课，周末愉快！
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Certainly the goalie staying put is an issue, as I said we'll deal with that in the problem set, but there's another issue here.
门将守在中路的确是个问题,我们会在习题集中研究它,但除此之外还有一个问题
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They will be Wednesday, Thursday, and Friday and we have six problem sets.
讨论课定于周三,周四,和周五,我们将布置六道习题
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The assignment for the next class is to do Problem 2 of Chapter 1, which I've repeated right here, and that's to think beyond what I've talked about in terms of what is Biomedical Engineering.
下次课的预习任务是做第一章课后习题二,我在这里重复一下,除了我已经说过的东西之外,去想一下什么是生物医学工程
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To attend these lectures in sections-- more on that in a moment; to submit 9 problem sets, take two quizzes and ultimately design a final project.
每节课都要来参加-,这个一会儿再解释，做完九套习题，参加两次测验，最后设计好期末的大作业。
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And in fact, one of the lessons you may already be realizing with P sets is that things seem to take twice, three times, four times longer than you actually might think.
从习题集中你可能已经得出的一个教训就是,程序所花的实际时间往往是你开始以为的两倍，三倍，四倍甚至更长。
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So you'll notice in your problem-set, sometimes you're asked for a number of orbitals with a set of quantum numbers, sometimes you're asked for a number of electrons for a set of quantum numbers.
希望你们在做习题的时候注意到，有时候问的是拥有,一套量子数的轨道数，有时候问的是拥有一套,量子数的电子数。
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So today is about writing some programs and empowering you to write your own starting this coming week when Pset One goes out via the website tonight by 7:00 p.m.
今天我们将要写一些程序，并且让你们,在接下来的一周写你们自己的程序，今天晚上七点,习题集1会发布在网站上。
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I want to mention that 5 you're going to get problem-set five is posted today, and I'll write which ones you can already do so far, because you don't have class on Monday.
我要指出的是,今天会贴出来习题集，我会给出你们现在可以做的题目，因为周一没有课。
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But, of course, what you saw in recitation, and hopefully, what you can now think very quickly by looking at this, is that this is not the only configuration of pi bonds that we could have in benzene.
当然，你们在习题课看到过，你们通过看这个可以很快的想到，这不是苯环里,唯一的π键构型。
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This should all sound incredibly familiar, like I'm just repeating myself in terms of photoelectric effect, because essentially that's what I'm doing, and that's one reason we spent so much time and did so many problem-set problems on the photoelectric effect.
这应该听起来极其熟悉，就像我在重复自己在讲光电效应时所说的话，因为基本上我正是在这样做，这也是我们在光电效应这个问题上,花这么多时间,做这么多习题的原因之一。
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I think most and you have talked a little bit about benzene over this past week in recitation.
我想你们大多数人,都在这周的习题课上讨论过苯环。
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So, in terms of practicing this weekend, I mentioned that instead of getting a problem-set today, what I am going to be posting is optional extra problems.
而对于这周的练习，我曾经说过今天将不会布置作业，但是会布置一些额外的习题。
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- Just to give you another several fun facts -- and next week, once we've looked at your Problem Set "Zero Submissions," which, if you haven't filled it out yet, you'll see asks a few demographic questions, a few geek-type questions so we can get a sense of the students.
我给你们分享另外几个有趣的事实-,在下周，一旦我们看到你们的习题集上是,“零个意见书“，如果你们还没有填写那个习题集的话，你们可以问一些人数统计方面的问题，或一些古怪的问题，那样我们就能对学生有个初步的了解。
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Problem Set One will be posted on the course's website tonight by 7:00 p.m. It will very clearly walk you through the week's challenges.
习题集1今晚7：00，将在课程的网站上贴出来,它将非常清晰地带领你们,通过这个星期的挑战。
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And this should look kind of familiar to some of the problems you may have seen on the problem-set if you started it this weekend.
如果你们这周就开始做习题集的话,这样的题目你们,应该会觉得很熟悉。
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And when that becomes relevant in a problem set, we'll point you at the appropriate documentation.
在习题集中如果你们遇到相关的问题，我们会提供适当的文档资料。
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If you have been working and are still working on problem Set One, do realize that a good deal of support and assistance is available to you.
如果你们一直在做并且还在做,习题集1，请认识到，可以寻求,其他人的支持和帮助。
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So you'll got plenty of practice with this on your problem-set if you haven't already.
如果你们还没有做习题集的话,你们将要做很多这样的练习。
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Do we offer what we dub packer editions of problem sets which extensively cover the same material but with a more technical sophistication, with more detail, and these are simply options that students in this course can elect as per the syllabus.
我们提供涵盖同样内容,但具有更多技术性细节的,我们称之为习题包，其中有更详细的信息,这些只是按照教学大纲的要求让同学们可以自主选择。
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And what is the shape, for one more clicker question on ammonia?
那它的形状呢？,再来一道关于氨分子的课堂习题？
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scratch Scratch is a program that you can download for free cs50 net and you will see in problem set 0 0 which will be posted on CS50.nettonight under problem sets in both standard and hacker editions, can you do the--can you--it will walk you through the process of getting this software.
你可以免费下载,今天晚上我会在0,放上习套题,这个习题集有两个版本，习题集可以指导你,如何下载这个软件。
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But again, more on that in problem set 1.
再回到习题集。
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The first problem set asked you to manipulate the model that I just presented-- the model of how you form portfolios and the model of the capital asset pricing model.
第一道习题,考察的是你们能否活用我刚刚给出的几个模型-,包括怎样构成投资组合的模型,和资本资产定价模型。
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Alright, so problem set 3.
好了，看习题集3。
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And for a couple of reasons, one this is the first P set where we're actually gonna give you code to work from.
由于一些原因，这里是第一个习题集,在此我们提供了一些代码供大家参考。
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