The Maya poured the chocolate drink back and forth between two containers so that the liquid had a layer of bubbles,or foam.

VOA: special.2010.02.17

Because there are ions moving back and forth, there's a current that flows and there's a electrical potential that's generated.

由于离子的进进出出,就产生了电流流动,并且形成了电势差

耶鲁公开课 - 生物医学工程探索课程节选

Yeah, over the past 2 years I've been back and forth in Brazil.

是，过去两年我来来回回去了巴西好多次。

我来自阿拉斯加 - SpeakingMax英语口语达人

Rebecca Skloot tells this complex story by going back and forth between subjects and time periods.

VOA: special.2010.07.21

So, when you think about resonance structures, some students tend to just get confused and be picturing this flickering back and forth.

那么，当大家想象共振结构的时候，有些同学很容易被弄晕,不停地来回想象。

麻省理工公开课 - 化学原理课程节选

Guitarist Jason Mozersky worked part-time driving bands back and forth to a performance center in Texas.

VOA: special.2009.05.08

That's the finger thing from left finger to right finger going back and forth across the board, never touching a number more than once.

在合并时，我的左手手指,和右手手指来回地在黑板上移动，但对每个数字只会碰到一次。

哈佛公开课 - 计算机科学课程节选

Or,he or she can place the hot glass on a metal table called a marver to shape the form by rolling it back and forth.

VOA: special.2009.09.16

And what happens if you want to move back and forth between a bunch of different letters?

如果你想阅读,不同的书信呢？

耶鲁公开课 - 新约课程节选

The jack fish inside these tall tanks swim back and forth quickly.

VOA: special.2009.09.18

So one very simple study by Spelke and Baillargeon: Have babies shown a block with a bar going back and forth like that.

斯皮克和巴亚热昂做了一个简单的研究,向婴儿呈现一个木块,木块中间有一个能够来回移动的木杆,就像这个样子

耶鲁公开课 - 心理学导论课程节选

The story moves back and forth in time, from different viewpoints.

VOA: special.2010.12.31

So, don't start here. And, it happens infrequently, but I've got to tell you, a few years back on the final exam, a couple of people were involved in passing information back and forth.

不要开始这样做，这也不常发生，我要告诉你们,几年前的期末考试里，有几个人，他们,给前后传递答案。

麻省理工公开课 - 固态化学导论课程节选

One of the hands keeps a flat hand shape and it just kind of lightly moves back and forth as if it were a flickering image on a screen."

VOA: special.2011.04.13

He and his wife Mary write back and forth about how evil slavery is.

他与他的妻子通过书信来往,表达对奴隶制的憎恶

耶鲁公开课 - 美国内战与重建课程节选

So there was bigger meal. There was a girlfriend involved, sometimes invited over to our house as well for the meal, and part of the family, and cards back and forth.

VOA: special.2010.02.08

We don't have to worry about how you solve it, but it's problem in mathematics and the answer will be--surprise, it's going to be oscillating back and forth and that'll come out of the wash.

我们没必要去担心这个方程该怎么解,但这个数学问题的答案将会是令人惊讶的,弹簧会来回振荡,问题就迎刃而解了

耶鲁公开课 - 基础物理课程节选

"If you see a number of scores on a hundred point scale on the 40,50,60 range that suggests that people are moving back and forth.

VOA: standard.2010.02.25

For Empson, there's a kind of a fluid and easy movement back and forth between what for hermeneutics are three very different phenomena: author, text, reader.

对Empson来说，在作者，文本，读者之间,诠释学里认为这是三种非常不同的现象：,在三者之间有一种流畅的反复的关联。

耶鲁公开课 - 文学理论导论课程节选

Right at the entry to the market, dozens of tourists crowd around its most famous attraction: a fish stand where the workers throw a salmon back and forth several meters over shoppers' heads.

VOA: standard.2010.07.14

that is,people who were administered,who are governed, but in the sense of having people passing papers back and forth, and having to sign every damn thing you could ever imagine- it's just unbelievable-- before they ever thought of themselves as being citizens.

也就是被治理者,被统治者,不过让人们来回奔忙为了申请批准,还要在每一份该死的文件上签名,从这个意义上来说,在他们视自己为公民前,这是令人难以置信的

耶鲁公开课 - 1871年后的法国课程节选

and Mexican officials. Every day, thousands of people on foot and in vehicles go back and forth across the border here, and millions of dollars worth of products cross the line in trucks and railroad cars.

VOA: standard.2009.04.30

The divine brothers banded together, They disturbed Tiamat as they surged back and forth, Yea, they troubled the mood of Tiamat by their hilarity in the Abode of Heaven.

这些神灵兄弟们凑成一伙，跑出跑进，让Tiamat烦恼不已，是的，他们扰乱了Tiamat的心境,他们自己却享尽了天国的狂欢。

耶鲁公开课 - 旧约导论课程节选

"The bank will estimate its costs based on its fixed costs, variable costs, the cost of their employees, the rent and so on and so forth.

VOA: special.2009.12.11

The sense of going back and forth, no one of us on top, not correspondent in a vertical way, how things going down there.

这种来来回回的感觉，没有人是在高处，也没人在低处。

普林斯顿公开课 - 人性课程节选

He began to read: (Music) "Four score and seven years ago, our fathers brought forth on this continent,a new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal.

VOA: special.2009.11.12

It comes back and forth in his memoirs too. In Speak, Memory that word appears. It's interesting.

这也在他的回忆录里反复提到，可以说，记忆那些文字再现，非常有趣。

耶鲁公开课 - 1945年后的美国小说课程节选

Here is Christopher Cruise reading the Gettysburg Address: Four score and seven years ago our fathers brought forth on this continent, a new nation,conceived in liberty, and dedicated to the proposition that all men are created equal.

VOA: special.2011.02.07

So, let's listen to this bit of klezmer music go back and forth between minor and major.

让我们感受下这段犹太音乐,它在小调和大调之间转换

耶鲁公开课 - 聆听音乐课程节选

We can go back and forth between these two equilibrium states They're connected.

我们可以,在这两个平衡态间往返,它们是相互联系的。

麻省理工公开课 - 热力学与动力学课程节选