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But that way you can give me Monday to change your section if you need to, which I hope you won't.
如果需要的话，你们可以在周一换组，虽然我不希望你们改。
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Yeah, I think if you live outside of London and you need to commute, you got to get the train.
如果你住在伦敦市区外面，你需要坐火车上下班往返。
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If you did it in the lab or on your computer screen, you would do it by pushing buttons.
如果你在实验室做，或者在电脑上做，你需要按键。
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You know, if you want to measure the potential energy of something in a gravitational field, you have to define the zero somewhere, right, because it's arbitrary. You can set it anywhere you want. It's the same with enthalpy.
你知道，如果你想测量重力场,中某种东西的势能，你需要，在某处定义一个零点，对吧？,因为势能的值是任意的,你可以把它设定在。
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You really want to get the power of dividing things up, but if you end up doing a ton of work at the combination stage, you may not have gained anything.
你真的想得到分解问题的能力,但是如果在合成的某个阶段,你需要做大量的工作，你可能得不到任何东西。
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It turns out you can list one, give it a name, and if you use square brackets, that tells the compiler I actually want to put multiple values inside of this -- inside of this variable and how do we do that?
结果是你可以列举一个，给它取个名字，如果你使用方括号，那是告诉编译器,在里面我需要许多的值--在这些变量里,我怎么做到的？
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But if you need a slave representing your business, and you live in Rome and you need somebody in Ostia, the port city of Rome, to be able to be there and watch your imports and your exports of your business, you need someone who can sign contracts, who can lend money, who can borrow money, who can do things like that.
如果你需要一名奴隶代理你的生意，如果你住在罗马，需要有人，在罗马奥斯蒂亚港口,照看你的进出口生意，就得要能签合同，可以放债贷款，及其他类似事务的人。
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I think this is a case where they need help, not deserve it, but I think, again, if you had a certain level of requirements to meet sustenance, you're gonna need help, like, if you don't have food or a place to live, that's a case of need.
我认为这个例子中，他们需要帮助，但并不他们是应得的，不过我认为，如果你在一定程度上需要他人救助以维持生计，你就需要别人的帮助，比如，如果你没东西吃，没地方住，这才是需要帮助。
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If you multiply her, then you want to have as much depth to fill in behind to close that hole as you can, so that that would make your phalanx more sturdy, because you could take more casualties without breaking, that seems reasonable to me.
如果再多一些,你就需要在后面增加足够的排数,尽可能地填补缺口,这会使你的方阵固若金汤,即使伤亡惨重也不影响阵容的坚固,这在我看来是合理的
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It's always a good first approximation, because you need to start somewhere in terms of drawing Lewis structures, but then if you go and figure out the formal charge and you just have lots of charge separation or very high charges, like a plus 2 and a minus 2 and a minus 1 all different places in the atom, what it should tell you is maybe there's a better structure.
它总是一个好的第一近似，因为在画路易斯结构的时候,你总需要一个起点，但是如果你在算出形式电荷之后,发现有很多电荷分开了,或者说有很高的电荷，比如有一个正二，一个负二，还有一个负一1,在原子的各个地方，这应该就是在告诉你,或许还有一个更好的路易斯结构。
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Even if you worked in a small shop, they only had eight workers and you were related to half of them.
如果你在一个小商店工作,你需要和八个员工的一半人协调工作
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I've got two states here, three states here, two here, I need four, and if I can come up with these bonds, four, by the Hund rule I'd fill them like this.
我们已经有2个状态在这里，3个在这里，2个在这里，我需要4个，如果我能想到这些键，四个，通过洪特规则，我们就能像这样排布。
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Now, again, we go through these faster then you can write, and as you all know, the lecture notes are posted on the website, so if you need to go back and refresh your memory on these things you can.
现在我们再快速的过一遍以便大家记录,而且你们都知道,课堂笔记都挂在网上,所以如果你们需要温习,加强记忆,你们可以看看笔记
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If you don't, we may have to review your future with this company.
如果不这样的话，恐怕我们需要重新考虑你在公司的发展前景。
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Now, you have to understand that when you buy a bond, if you buy it at issue, you get the first coupon in six months, the second coupon in one year, the third coupon in eighteen months, and the last coupon you get at the maturity date.
你们需要了解,如果在发行时就购入债券,六个月后会得到第一笔票息,一年后第二笔,18个月后第三笔,到期时得到最后一笔票息
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In C and most programming languages, if you need greater than or equal to, use greater than and then right next to it with no space put equal to, and that conjures up the same idea.
在C和大部分的编程语言中，如果你需要表示大于等于,在“>“号后边加上一个“=“,中间不要空格，那使我们联想到同样的想法。
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So if you're working with cyanide in the lab as potassium cyanide or sodium cyanide, those are what are called p h s's, it's a rating for different kinds of chemicals.
因此如果你在实验室中,需要用到氰化物，比如氰化钾或者氰化钠，这就是所谓的，“P，H，S“,这是化学药品有害程度的一个级别。
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You need to, if you want something to be printed out inside your code, you need to tell the machine to do that.
你需要，如果你想要,在代码中显示一些东西的话，你需要告诉机器这么做。
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These won't be graded, you don't have to turn them in, it's just to give you some extra practice if you want while you're studying for the exam.
这些题目不会记分，你们也不需要交上来，只是如果你需要的话，这可以让你,在准备考试的过程中得到更多的训练。
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If it's important enough for you to retain I'll stop and pause on it in class and discuss it in enough detail so you'll be able to learn it.
如果真的很重要到需要你们记住,我会在课堂上进行详细地讲解,这样你们就能掌握了
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So realize the support structure is now in place and in progress so do just let us know at help@cs50.net if you have questions that can't be addressed during office hours.
所以请意识到支撑结构已经出来了，并且正在进行,如果需要帮助，如果在课堂时间有任何不懂的问题,请在help@cs50，net上面给我,留言。
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I don't think either of us are thrilled with the text, it's the best we've probably found for Python, it's OK. If you need it, it's there.
我不认为我们俩对于这个课本很满意，这是我们能找到的，最好的版本了，还不错，如果你需要它，就在网站上。
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As an aside, if you ever just have one line of code that you want to execute, one puzzle piece in Scratch terminology, ; you actually don't need the curly braces; you only need the curly braces if you have two or more lines of code that you want to execute if that condition is true.
此外，如果你只有一行代码,需要执行，在Scratch，术语中叫做,一句代码，你就不需要使用花括号了;,如果那个条件成立，你有两行或更多行的代码时需要执行时,你就需要花括号。
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So, if, for example, we were looking at a hydrogen atom in the case where we have the n equals 1 state, so the electron is in that ground state, the ionization energy, it makes sense, is going to be the difference between the ground state and the energy it takes to be a free electron.
电离氢原子所需要的能量,如果我们看n等于1的情况,电子在基态，那电离能，很合理的就是基态,和自由电子态的能量差。
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