But recent findings have suggested that tPA may be effective in saving brain tissue even if three to four and a half hours have passed.

VOA: special.2009.08.12

It is 1.7475. Conclusion: if I start to react sodium with chlorine, the result is a crystal, a three-dimensional array.

这是1。7475，结论就是：,如果我使钠和氯反应，结果将会是一个晶体，一个三维排列。

麻省理工公开课 - 固态化学导论课程节选

So that means that if we have three orbitals, we can only have six electrons in those complete three orbitals.

所以那意味着如果我们有3个轨道，我们有且只能有6个电子,在这3个完整的轨道。

麻省理工公开课 - 化学原理课程节选

If they become infected, especially after the first three months of pregnancy, they can get very sick or even die.

VOA: special.2009.08.05

But, if you look more carefully, you will find that this is a blend of three different forms of carbon.

但是，如果你们再认真一点，会发现,它是三种形式的碳的混合物。

麻省理工公开课 - 固态化学导论课程节选

If they become infected,especially after the first three months of pregnancy, they can get very sick or even die.

VOA: special.2009.08.18

Now if you smiled to-- or make three people smile, and these three people-- each one makes three other people smile.

如果你的笑-,感染了三个人，这三个人-,每个人又引起另外三人发笑。

哈佛公开课 - 幸福课课程节选

"If you're texting while driving, you are twenty-three times more likely to get into an accident than somebody who isn't.

VOA: special.2010.07.01

So at this point in the story-- at this level in the story, if you will, I've touched one, two, three, four numbers total or I've made two comparisons.

那么这时，我总共已经动过了1，2，3，4个数字,或者说我做了两次比较。

哈佛公开课 - 计算机科学课程节选

But experts generally advise against using the drug if more than three hours have passed after the first signs of a stroke.

VOA: special.2009.09.22

If you're unsure about that, check out, of course, chapter three in the textbook, where these issues are addressed.

当然,如果还不确定,可以看看课本的第三章,这些问题都提到了

耶鲁公开课 - 聆听音乐课程节选

If you want to have power in this society you must master the three literacies this is a class about power,your power."

VOA: special.2009.04.27

And,when I once took the train over to Poitiers,it took three hours, because if you go across the lines it's not good.

由此我坐火车去普瓦捷,会花三个小时,因为穿过省界的话是很不合适的

耶鲁公开课 - 1871年后的法国课程节选

But traditional guidelines say not to use tPA if more than three hours have passed after the first signs of a stroke.

VOA: special.2009.08.12

If you or I buy it, it costs $51 per dose, you need three doses to be effective.

如果你或者我购买它,每支将花费五十一美元,你需要购买三支才会起效

耶鲁公开课 - 生物医学工程探索课程节选

If a batter gets three strikes, he loses his turn at bat and is called out.

VOA: special.2009.04.12

So if your word game doesn't work when the words are 12 letters long, instead of continuing to debug 12 letter hands see if you can make it fail on a three letter hand.

因此如果你的单词游戏当输入单词,有12个字母的时候没法运行了，看看输入三个字母的单词它,能不能正常运行吧。

麻省理工公开课 - 计算机科学及编程导论课程节选

In eighteen eighty-three, American poet Emma Lazarus wrote a poem as if Lady Liberty were speaking.

VOA: special.2010.09.17

If two object are in the same temperature, and two other object are in the same temperature, then all three must have the same temperature.

如果有两个物体的温度相同，又有另外两个物体的温度相同，那么这三个物体一定有同样的温度。

麻省理工公开课 - 热力学与动力学课程节选

And if the room is really noisy, she may say it is a three ring circus.

VOA: special.2009.01.11

If there are three possibilities--dead, alive, or suspended-- to be dead, we could still say you've got to be broken, incapable of P-functioning.

如果有三种可能，生存，死亡或者假死-,要死亡的话，你必须是被破坏的状态，无法拥有人格功能性。

耶鲁公开课 - 死亡课程节选

If you cannot access our Web site, send the information to VOA Special English two-zero-two-three-seven USA.

VOA: special.2009.10.16

Now, if you are standing there with your -- by the way the first three rows have a chance of hitting each other.

现在,如果你站在那里用你的 --,顺便提一下前三排有机会互相攻击

耶鲁公开课 - 古希腊历史简介课程节选

She said when she first sought political office in nineteen eighty-three it was as if "the strong role of women in Cherokee life had been forgotten by some of our own people."

VOA: special.2010.04.09

If they do make big bets maybe they get lucky once, or twice,or three times, but ultimately their luck is going to run out.

搏大了,可能会侥幸那么一次,两次或三次,但最终运气是会用完的

耶鲁公开课 - 金融市场课程节选

"The reason is that those plants are going to get so big that if you were to put three or four or six plants in, they are just going to be crowding each other out, and each plant is going to underperform."

VOA: special.2011.06.14

And so tradition just said, "Well if there are three gifts,there must be three kings."

所以传说在流传过程中，人们认为，“有三样礼物，那必定有三位国王“

耶鲁公开课 - 新约课程节选

If all goes well, scientists hope Herschel will be working for three years, and the Planck telescope for about 15 months.

VOA: standard.2009.05.14

And if you use these three agencies, then everyone would be approved by the regulators.

如果你使用这三个评级公司，每项贷款都能获政府通过。

斯坦福公开课 - 经济学课程节选

Let's look at my payoffs from choosing these three options Up, Middle, and Down, if I think it's equally likely that my opponent will choose Left and Right.

我们来看一下我从上中下这三个策略中,分别能获得什么样的收益,如果我认为我对手,选择左或右的可能性相同

耶鲁公开课 - 博弈论课程节选