Once the shuttle is retired this year, the only way for the United States to get astronauts into orbit will be on Russian Soyuz rockets.

VOA: special.2010.04.28

Never go back. Find another. Leave at once. Go for a long trip again, but this time we'll go wherever I want, won't we?" I nodded. My Lolita.

绝不会去，另找一所学校，马上走，再去长途旅行，不过这次去我想去的地方，好吗？“我点头，我的洛丽塔。

耶鲁公开课 - 1945年后的美国小说课程节选

So this design of having students on campus once a month for intensive classes allows students to continue working full time.

让学生每月来校一次,进行现场教学的设计,允许学生继续全职工作。

哈佛公开课 - 幸福课课程节选

The UN High Commissioner for Human Rights,Navi Pillay, who disagreed with this decision, is once again calling for an investigation.

VOA: standard.2009.10.25

Do I have two yes answers if you wanna check two conditions at once? You know, this might seem to be a bit of a new context for some of you but consider a typical website.

我能不能对两个条件同时判断,来看看它们是不是都为真？,这些概念可能对你们中一些人有点新颖,那么就考虑一个典型网站。

哈佛公开课 - 计算机科学课程节选

Once you get this information then you are going to be able to differentiate between a risky proposition for purchase to a less risky ."

VOA: standard.2010.05.28

In this book, what I wanna just hit home here, especially for those if you are watching this, is that spiritual life and religious expression is not something that you do once and then you're done.

这本书，我想重申它的精彩之处，观众们，在于告诉你们，精神生活和宗教表达,并不是一次就,可以完成的事儿。

普林斯顿公开课 - 人性课程节选

"They were willing to risk their lives, in this case, to prevent Afghanistan from once again becoming a safe haven for al-Qaida and its extremist allies.

VOA: standard.2009.10.26

And so it didn't take long, once this vaccine were--was available, for people to want to get organized and think about ways of delivering this vaccine to all the regions of the world where people were potentially infected.

这并不会花费很多时间,一旦疫苗生产完毕,一些人就会组织起来,并想办法把将这些疫苗送往,世界上一些地方,那些地方的人很有可能感染疾病

耶鲁公开课 - 生物医学工程探索课程节选

I will give you all development and all you have to do is every once in five years make sure you come and vote for me, and this thing will go on,"

VOA: standard.2010.02.24

Once you're doing this on your own, -- especially, for example, on exam 2, which is a ways down the road, you won't be able to look at those steps, so you need to make sure that you can go through them without looking at them, but for now we can look at them as we are actually learning how to draw the Lewis structures, and rather just go through them step-by-step, it's more interesting to do it with an example.

每当你要画一个路易斯结构的时候，特别是，比如，在第二次考试中，在不远的将来，你将看不到这张表，因此你需要确保自己在不看这张表,的情况下也能按照上面的流程来画，但是目前我们是可以看着这张表,来学习如何画路易斯结构的，而相比于一步一步地讲，通过例子来演示一下会更有意思。

麻省理工公开课 - 化学原理课程节选

Well in C and other languages that we'll see this semester, you use what's called the for loop, and this as syntax isn't quite as straightforward but once you know what to look for, it's very easy to understand.

在C语言和一些我们这学期将要接触的编程语言中，你将会用到所谓的for循环，也许作为一种语法规则，它看起来不是那么的通俗易懂,但是你一旦知道曲中奥妙，就不难理解了。

哈佛公开课 - 计算机科学课程节选