"If it's like during school when things are busy, once maybe for like twenty minutes max.

VOA: special.2009.09.14

Another thing is that, when once an invention is made, it tends to be copied all over the world.

另外，一旦一个发明诞生，它就会被模仿并应用于世界各地。

耶鲁公开课 - 金融市场课程节选

And once you... when you're having that bad of a season, it's really hard to get everyone passionate about it,

所以一旦赛季取得很差的成绩，就很难保持球队的激情，

足球部队长的领导力 - SpeakingMax英语口语达人

Dr.Lepora says she will probably return to MSF, because she says once she learned how to be effective in a crisis situation, she finds it very difficult not to act when another crisis comes up.

VOA: standard.2010.06.29

So whether we finish it today, or more likely when we finish it up on Friday, once we get passed isoelectronic atoms, that's it, that's all you need to study for this first exam.

因此，我们也许今天讲完，或者更有可能周五讲完，无论如何，就到我们讲完等电子原子为止，这是你们第一次考试所需要准备的全部内容。

麻省理工公开课 - 化学原理课程节选

Pretty much I think about it only once a year, when I'm giving this very lecture.

最多是一年想一次，当我要上这节课时。

耶鲁公开课 - 死亡课程节选

And when I threw those away, I was left once again with a little box, and I could do it again, and again, and again.

剔除之后,我得到了更小的方格,我可以一次一次的重复这个过程

耶鲁公开课 - 博弈论课程节选

It is nevertheless a distinction that does exist, once you think about it, that deserves to exist and deserves to be remembered when we think about the variety of ways in which literary history can be written.

但是这区别既然存在，只要你思考它，它就有存在的理由,值得被记住，并被记录到,文学的无限发展可能的历史中。

耶鲁公开课 - 文学理论导论课程节选

We have, for example, bomb drills just in case something happens people think it's right When thing happens once and you move on, go back to life, just as something goes wrong and then you move on.

例如，我们有，炸弹演习以防发生什么事情,人们认为这是应该的,发生了一件事，你要继续正常的生活，正如某事出了点问题，然后你继续前行。

普林斯顿公开课 - 人性课程节选

It's just the sheer--it's amazing, it's an amazing read too. And then, Marc Bloch; I once had the pleasure when I was giving a talk at the University of Strasbourg and sitting in Marc Bloch's office.

那真的是--真的特别棒,也是本好书,还有马克·布洛克,我曾经有幸在斯特拉斯堡大学演讲时,坐在马克·布洛克的办公室里

耶鲁公开课 - 1871年后的法国课程节选

It takes an int; deal with it when you get to it and then once you look through the whole file, should you find -- ultimately find the actual code that defines or impliments this thing.

它携带一个int数，当你获得了它就处理它,然后一旦你查看整个文件，最终你将发现实际代码中,定义或执行了这个东西。

哈佛公开课 - 计算机科学课程节选

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

Because it's hard when you go back being part of any group. Once you are in that group, and away from other people, it's very hard to remember We've talked that -Oh, have you?

因为如果你回到原来的群体中,就会变得难了，因为你只要一呆在那个群体中，远离其他人，就很难,我们聊过这个，-是吗？

普林斯顿公开课 - 人性课程节选