If you are going out with your girlfriend,or boyfriend, you do not want another friend to go along on your date.

VOA: special.2009.07.26

So if you wanna do something conditionally, you generally needs to ask the question, is the following true or false.

假如想在一定条件下做一件事情，你需要判断下这个条件，来看看条件是真还是假。

哈佛公开课 - 计算机科学课程节选

And I think too, a really good exercise if you wanted to do is, if you have a dictionary,

我也认为，如果你想练习，如果你有字典的话，比较好的练习

有这样的困难 - SpeakingMax英语口语达人

But if you want to visit the newly opened Statue of Liberty, you must do it within the next two years.

VOA: special.2009.06.29

Do you have a visceral sense, "oh, don't do that"? If you do, you were probably taught, like me: "never, never damage a book.

你们想发自肺腑地说一句：“哦不，不要这样“吗，如果是，那你们和我从小被教育的一样：绝对不要损坏书本。

耶鲁公开课 - 1945年后的美国小说课程节选

For example, if you say bad things about a person, the person might protest and say "Do not bad mouth me."

VOA: special.2010.06.20

What does come out, which is very useful is, if you do run the reaction, here's how much heat comes out.

能得到的结果是，如果我们进行这个化学反应，有多少热量放出，当然这也是很重要的。

麻省理工公开课 - 热力学与动力学课程节选

If you do not see any big animals near the river, Mist can tell you about birds instead.

VOA: special.2009.08.19

H And, by the way, if you do this for the hydrogen, H it ought to come out the same.

顺便说一句，如果是，或者如果是。

麻省理工公开课 - 固态化学导论课程节选

Maybe even lots of snow. If you do not have to drive in it or remove it, snow can be very beautiful.

VOA: special.2009.01.26

They thought, for example, if you could do something with one element, if you looked at an element very close to it, it would be similar enough that you could maybe replace it with that.

他们认为，比如，用一种元素可以做的，用它邻近的元素，代替它的位置,也应该能做到。

麻省理工公开课 - 化学原理课程节选

And if you do, here is a question you can answer: Who do you consider a "folk genius?"

VOA: special.2010.01.18

0 So if you do for instance 11 divided by 10 in grade school, 1 that's 1 with the remainder of 1.

举个例子，11除以，得1余。

哈佛公开课 - 计算机科学课程节选

Anderson then told the southerners, "If you do not shell us to pieces, hunger will force us out in a few days."

VOA: special.2009.08.06

Good even to be aware of what they don't To be aware of that, right. But most importantly, think about that your passion are about 'coz if you do what you love, the money will follow.

无私得自己都没意识到,对，没有意识到那些钱，但最重要的是，要思考你对什么充满了激情,因为如果你做的是你爱做的事，钱跟着就会来。

普林斯顿公开课 - 人性课程节选

If you are careful, you will soon see his true colors, and have nothing to do with him.

VOA: special.2009.05.24

As I keep moving down, that part gets smaller, it's not always the initial length of the list, and you're right. But if you do the sums, or if you want to think of it this way, if you think about this more generally, it's always on average at least the length of the list.

等等，随着移动，剩下的部分越来越小，并不是初始那么长了，如果你算一算，或者你这么想，你考虑更一般的情况，平均下来至少是列表的长度。

麻省理工公开课 - 计算机科学及编程导论课程节选

Well,I hope you do a good job,Colonel. If I do not, you will have my profound apologies.

VOA: special.2009.03.22

And if you do that over the fullness of time, your reinforcement and punishment will give rise to a pig who walks forward.

如果你长时间的这么做，你的强化和惩罚,就会使这头猪形成向前走的行为。

耶鲁公开课 - 心理学导论课程节选

You can do a better job of bluffing if you hold your cards close to your vest.

VOA: special.2009.11.22

When you buy high and sell low it's really hard to generate returns, even if you do it with great enthusiasm and great volume.

当你高价买入低价卖出时,是很难产生回报的,不管你有多大交易热情或有多大交易量

耶鲁公开课 - 金融市场课程节选

He says his message is that you can do anything if you put your mind to it.

VOA: special.2010.02.26

Be a man, be proud of what you should be proud of, but don't go beyond limit of what is human, because if you do terrible things will come.

作为一个凡人,你可以为值得自豪的事自豪,但是不能超越凡人的界限,因为一旦越界,就会灾难临头

耶鲁公开课 - 古希腊历史简介课程节选

After that,if you do fertilize the bulbs, do not mix the fertilizer in the planting hole.

VOA: special.2011.04.12

if you do that under the situation where you've put your plasmid into these micro-organisms then you're going to have little colonies that grow many copies of the bacterial cells.

如果你在质粒已经进入了微生物,的情况下培养它们,你就会得到许多小菌落,里面长有很多增殖出来的细菌

耶鲁公开课 - 生物医学工程探索课程节选

You do not always know if a clay object will survive being fired at high temperatures.

VOA: special.2009.09.09

If you do, the unit vectors are called i prime and j prime, the components of the vector change.

如果这么做,单位矢量就是 i' 和 j',矢量的两个分量也会发生变化

耶鲁公开课 - 基础物理课程节选

You might learn that haste makes waste if you do something so fast, resulting in mistakes.

VOA: special.2011.03.27

If you do that at home I think, but don't trust me, you'll find out that X is equal to a third.

如果你回去自己计算一下,你会发现X等于1/3

耶鲁公开课 - 博弈论课程节选

if you do get to go to like conferences all over the place and that kind of thing.

就是说如果你有机会参加这种会议。

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