How had the country existed half-slave and half-free for so many years, Lincoln asked.

VOA: special.2009.06.11

The other quick thing I want to say is that I do have office hours today from 3 to 5, so feel free to stop by if you have questions about problem-set 3 that you're finishing up.

我还想说一件小事,我今天的答疑时间是三点到五点，如果你对于第三次作业还有任何疑问,请在这个时间段来找我，不必客气。

麻省理工公开课 - 化学原理课程节选

And I'm a free-lancer, so I can't get an unemployment insurance.

我是一个自由职业者，所以没有失业保险。

911事件的影响 - SpeakingMax英语口语达人

So studying the organisms in these oxygen-free caves gives clues about the past.

VOA: special.2010.11.10

shuttle cs50 net So if you go back to shuttleboy.cs50.net, you can pre-order for free your own CS50 Shuttle Cards, Shuttle Cards particularly those of you in the Quad, Mather and the like.

如果你去看，你可以免费，提前预定自己的。

哈佛公开课 - 计算机科学课程节选

So is cigarette smuggling. Smugglers stock up on cigarettes in low-tax states or buy them tax-free on Indian reservations.

VOA: standard.2010.08.11

So this maintained, even when-- why would a person free a slave?

这一直保留到。。。,为什么主人要释放奴隶？

耶鲁公开课 - 新约课程节选

To explain the fact that we've got free will, so the objection goes, we have to appeal to-- we have to posit--the existence of a soul, something non-physical, something more than purely physical.

要解释我们有自由意志这一事实,反驳者会说,我们不得不诉诸,或者假定灵魂存在,这里提到的灵魂是非物质并超出物质的东西

耶鲁公开课 - 死亡课程节选

So if you like toys feel free to reach out there-- what's that?

如果你喜欢玩具，你可以到那儿看看--那是什么？

哈佛公开课 - 计算机科学课程节选