Norman's family urged him to continue his studies at a time when many farm boys left school to find a job.

VOA: special.2009.11.10

I would say, okay, this guy wants me to find a function which reduces to the number a when I take two derivatives, and I know somewhere here, this result, which says that when I take a derivative, I lose a power of t.

出题者想要我找出一个函数,它在经过两次求导后得到数字a,我知道这里的某个地方,这个结论告诉我,我每求一次导,t就降一次幂

耶鲁公开课 - 基础物理课程节选

but it's just like a time when they really took the care to look at how to construct things.

但它代表了一个时期，那时他们真正关注搞建筑的方法。

我喜欢的建筑物 - SpeakingMax英语口语达人

There used to be a time when the quickest way to travel across the western United States was in a stagecoach.

VOA: special.2010.04.26

What you have there is a moment when the perception of the child becomes the perception of the world imbued with imagination.

那时是孩子的感知,成为了世界的感知。

耶鲁公开课 - 1945年后的美国小说课程节选

Woodstock is described as a moment when the news media first recognized music and entertainment as a cultural and commercial force.

VOA: special.2009.08.10

This becomes really, really important, not just when you're starting a business but when you're trying to grow that business.

这变得非常，非常重要，不仅对创业重要,而且对扩大业务也很重要。

斯坦福公开课 - Twitter之父Jack.Dorsey演讲：好奇和灵感的力量课程节选

He wrote books. And,in nineteen eighty-six, he became a father when his wife Jeanne gave birth to their daughter,Camera.

VOA: special.2010.02.07

At a time when beards meant a great deal religiously, he's telling the men to shave off their beards.

在当时人们把大胡子当做虔诚的象征,彼得却叫人把胡子都刮了

耶鲁公开课 - 欧洲文明课程节选

But she has suggestions for students entering their final year of college who want a job when they graduate.

VOA: special.2010.06.11

You would first get exposed in children-- in childhood and then at a point when you're susceptible to the disease.

在儿童期这个较容易受病毒感染时期,第一次接触该病毒,就会引起发病

耶鲁公开课 - 生物医学工程探索课程节选

People can also cause a blockage when they try to clean out their ears, but only push the wax deeper inside.

VOA: special.2010.03.31

It is being written and redacted at a time when there is a king in Israel, there have been kings in Israel, and it is providing laws for the construction of an ideal monarchy.

它是在以色列有国王的时候写成并编辑的，以色列曾有过国王，它为建立君主理念提供了律法。

耶鲁公开课 - 旧约导论课程节选

Farmers can start rotational grazing by removing animals from a pasture when the grass is eaten to less than 5 centimeters.

VOA: special.2009.01.06

I know this is a simple example, but when you mature as a programmer, one of the first things you should do when you sit down to tackle some problem is write something like this pseudo code.

我知道这是个很简单的例子，但是当你们成长为一名程序员后，当你们碰到问题后第一件事情就是,该写一些类似于,伪代码的东西。

麻省理工公开课 - 计算机科学及编程导论课程节选

Doctor Selanikio says he first recognized a need when he worked for the United States Centers for Disease Control and Prevention.

VOA: special.2010.05.03

For 6 years,I was a resident tutor in Leverett House when I was a graduate student and then I also started to teach.

我做过6年莱弗里特宿舍的住校导师,我研究生在读时，就开始任教。

哈佛公开课 - 幸福课课程节选

Now,there came to my ears a low,dull,quick sound, such as a watch makes when inside a piece of cotton.

VOA: special.2009.05.16

But Hobbes lived at a time when the modern system of European states even as we understand them today, was just beginning to emerge.

霍布斯生活在一个时代,这个时代中，现代欧洲国家,就像我们今天理解的这样，已经快要出现了。

耶鲁公开课 - 政治哲学导论课程节选

Farmers can start rotational grazing by removing animals from a pasture when the grass is eaten to less than five centimeters.

VOA: special.2010.01.19

In an effort to get more to keep the economy from collapsing at a time when at a time of great concern about the structure of the financial system.

在一种得到更多的努力中,预防经济在一种时期中崩溃，这个时期是,人们都很担忧,金融系统的结构。

耶鲁公开课 - 金融市场课程节选

The surprise visit came at a time when the United States and other countries have been putting more pressure on North Korea.

VOA: special.2009.08.08

Here's a period when the body's been functioning and goes like this.

这是身体一直在运作的阶段。

耶鲁公开课 - 死亡课程节选

Paul Sereno said the fossil will be returned to China and put in a museum when the scientists have finished their studies.

VOA: special.2009.10.13

In other words, here is a moment when Levi-Strauss is admitting something about his own work which he is not admitting in his analysis of the Oedipus myth in the essay from Structural Anthropology that you read last time.

换句话说，在这里，列维承认了,关于自己作品的一些观点，而这些观点,是他在《结构人类学》中的那篇文章中,分析俄狄浦斯神话时所没有承认的,大家上次读过那篇文章。

耶鲁公开课 - 文学理论导论课程节选

Professor Harkema says there could be a day when Rob Summers and other paraplegics like him will be able to walk again.

VOA: special.2011.06.01

Now this was nineteen-eighty-two, quite a long time ago, at a time when people really weren't paying much attention to calories like they are now, so you'd expect the errors to decline as time goes on and there's some evidence of that, but they're errors nonetheless.

这是1982年的实验,很早之前了,当时的人们并不像今天的人们一样,那么关注卡路里,所以你会预计误差会随时间推移而减小,有证据证明了这一点,但误差仍然存在

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Benjamin Hooks was born in Memphis,Tennessee, at a time when the southern city discriminated against blacks in all areas of public life.

VOA: special.2010.04.24

One time, I paid a beggar when I was driving in my car and I was stopped to the stoplight,

有一次，我给过乞丐钱，当时我在开车，正在等红灯，

不做善事的理由 - SpeakingMax英语口语达人

That's a simple thing and it's so very different depending on the time of a year when you do it.

这很简单，而你所看到的,也根据季节的不同而有所变化。

普林斯顿公开课 - 人性课程节选