People can't afford them. That's why we don't really have a malaria vaccine yet, because no one in rich countries really suffers from malaria.

VOA: special.2010.03.29

In fact, I do this as well, I mean I have water with me and I have no idea why because I'm not particularly dehydrated.

事实上,我也整天带着水壶,我是说我随身带水,但又不知道为什么要带,因为我并没有特别的脱水症状

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

I think the reason why triathlon is not so, so big is just because it requires a lot of time.

我认为铁人三项运动之所以不够普及，
是因为它需要大量的时间。

对体育项目的热爱 - SpeakingMax英语口语达人

Why has the season been delayed? Because the singer's lover has left her.

VOA: special.2010.03.15

Why? Because that block identifies a set of things that I'm going to do if the test is true.

为什么呢？这是因为这一块指令,指定了一系列的要进行的操作,如果测试为真的话。

麻省理工公开课 - 计算机科学及编程导论课程节选

Here is her opinion on why people like chocolate so much: "Well,scientists tell us that we all love chocolate because there's a chemical response that takes place in our brains.

VOA: special.2010.02.17

One might win it in chemistry because the disciplines weren't as diverse as they are today. So, that's why I hesitate.

他之所以得到化学奖,是因为当时学科不像现在多样化,这就是我为什么会犹豫。

麻省理工公开课 - 固态化学导论课程节选

That's why I chose the NAACP. Because their method was legal change through the court system, or through action by the Congress."

VOA: standard.2010.04.16

Then you say, well why didn't they divide by 365, because I know there are 365 days in a year?

也许你们会问,为什么他们不除以365,因为一年有365天

耶鲁公开课 - 金融市场课程节选

We like them and they like us also, so that is why we love this area here, because of the people,nothing more,".

VOA: standard.2009.11.05

Why is money worth having? Well, money's worth having because, among other things, you can buy ice cream with it.

为什么钱是值得拥有的？,因为不算其他，你可以用钱买冰淇淋。

耶鲁公开课 - 死亡课程节选

"The reason why we want to come to this one is because we really want this phone."

VOA: standard.2010.06.25

Why? Because the Jews didn't like the tax collectors because they were being ripped off by them.

为什么，因为犹太人不喜欢税吏,因为他们被剥削。

耶鲁公开课 - 新约课程节选

I just didn't feel like it. I didn't,why?Because of the crowds and the people and the lines,".

VOA: standard.2009.12.28

And the reason is, and this will come up on the problems and a lot of students end up using this equation, which is why I want to head it off and mention it ahead of time, we can't use an equation because this equation is very specific for light.

原因是，很多同学在解题时,都会用这个方程，所以我要,事先提醒你们一下,我们不能用这个方程，因为它只对光是用。

麻省理工公开课 - 化学原理课程节选

"What we see that because the supply of the gold is depleting, that's why the cost of digging the gold out of the earth is very high."

VOA: standard.2010.07.21

That's why we don't have an arrow here, because we could go back, this way too.

这就是为什么我们这里没有用箭头的原因，因为我们可以过渡回去，像这样。

麻省理工公开课 - 热力学与动力学课程节选

I meet with my teachers and they are very experience and intelligent people and the reason why I chose political science is because I have always had a passion for politics,".

VOA: standard.2009.12.14

And also because, and this is also the reason why the power points are always available, I want you to be engaged in the material.

另一个原因，之所以提前提供幻灯片，我希望你们能充分理解材料。

哈佛公开课 - 幸福课课程节选

Why?Because this is where you find number one the world's biggest chunk of population - really between India and China there you have it, two-thirds the population just settled in this area.

VOA: standard.2009.12.23

So hopefully there is indeed a way to fix this, but it looks as though the division operator, the single slash is division but -- and here's a curiosity about many programming languages -- because 17 is an integer and because 13 is an integer, why do I say that?

我的确希望有一个方法来修正这个错误，但是看起来,好像那个除法操作，那个斜杠是除法,但是--对于很多编程语言来说,是挺奇怪的--因为17是一个整数,13也是一个整数，为什么我这样说？

哈佛公开课 - 计算机科学课程节选

"A lot of units from different areas, different parts of the country have to integrate,work as a team, and that's why we come here to practice because we need to be ready in case something does happen."

VOA: standard.2010.07.21

Yeah, so you're asking, if for example, why do you need a booster of tetanus, because if I get exposed to tetanus wouldn't I have this rapid response?

所以你会问,举个例子来说,已经感染过破伤风杆菌的人,为什么仍然需要接种破伤风疫苗,身体不是应该马上对该病菌做出应答吗

耶鲁公开课 - 生物医学工程探索课程节选

"Everybody used that picture as a motivational tool of why we're truly here, because regardless of what's going on and how devastating it is, there are still people that recognize and believe that the Comfort is here to help them."

VOA: standard.2010.03.26

Why is it disgusting? It's disgusting because people don't tidy up.

为什么会很脏乱啊,因为没人打扫啊

耶鲁公开课 - 博弈论课程节选

"The reason why I do not think it is likely is because of all the resources we have put on this, considerably more than the last administration did, to see to it that it will not happen."

VOA: standard.2010.02.14

Finally though, the point that he makes is a terrific one, all of these things seem natural to us but the reason why they seem natural is not because they are in some sense necessary or logical truths.

最后，尽管，他表达得很好，所有这些对我们而言很自然,但我们认为他们自然的原因,并非他们是必要的,或是逻辑真理。

耶鲁公开课 - 心理学导论课程节选

She gave them a chance to choose," "This is why I am here, this why so many tens of thousands of people are here, because we want to show Saylan we appreciated her, we love her and despite all the work she has done she was treated as a guilty person by the state, and we do not approve of that."

VOA: standard.2009.05.20

And I'm very interested in what happened in the French suburbs two years ago; in fact, I wrote an instant article on it for an encyclopedia because some of the work I'd earlier done was about why French suburbs and European suburbs are different than American suburbs.

我对两年前,在法国郊区的事很感兴趣,其实我当时就给一个百科全书,写了一篇文章,因为我以前研究过,为什么法国和欧洲的郊区,与美国郊区有这么大的差别

耶鲁公开课 - 1871年后的法国课程节选

The main reason why I say that is actually not necessarily because of what's in the museum, but because of the museum itself.

我这样说，并不一定是因为博物馆里的东西，而主要是因为这个博物馆本身。

喜欢的艺术家 - SpeakingMax英语口语达人