When societies cooperate with the aim of creating a public good, there is always the possibility of a free-rider.

VOA: special.2009.03.03

I basically gave them free ray at the beginning, so they work in small groups, and travel from site to site.

在最初，我给了他们充分的自由，孩子们组成学习小组，在各地游览。

麻省理工公开课 - 媒体、教育、市场课程节选

which is one of the few museums in D.C. that actually isn't free because it's not a national museum.

那是特区里少有的几个收费博物馆之一，因为它不是国家博物馆。

大都会艺术博物馆 - SpeakingMax英语口语达人

What may be more important to most Americans than religion among their fellow citizens is a government free of it.

VOA: special.2010.03.05

And it's always going to come down to calculating the appropriate free energy, and how it changes in the process.

这总是涉及到计算,适当的自由能，以及这些自由能在过程中如何变化。

麻省理工公开课 - 热力学与动力学课程节选

He claimed that living in Illinois and Wisconsin -- where slavery was illegal -- had made him a free man.

VOA: special.2009.05.14

So the status of slave was lowest, ; freed persons was next highest in Roman Law; and free people were next.

所以罗马律法中，奴隶的地位是最低的，然后是自由人;,接着是自由民。

耶鲁公开课 - 新约课程节选

He sentenced Brown to be hanged. One of Brown's supporters attempted to find a way to free Brown from jail.

VOA: special.2009.07.02

And why is that? Within the perspective of Milton's free-will theology, sin can't exist as an external reality.

为什么呢？从弥尔顿自由意志的学说的角度来看，原罪是不可能以永久现实的形式存在的。

耶鲁公开课 - 弥尔顿课程节选

Under George Steinbrenner the Yankees made offers for nearly all of the best free agents, says sports economist Andrew Zimbalist.

VOA: special.2010.07.26

figuring out there is no such thing as a free lunch but Markowitz tells us that diversification is a free lunch.

知道世上没有免费的午餐这回事,但马科维茨称分散投资是免费的午餐

耶鲁公开课 - 金融市场课程节选

Mister Jungen has said that the sports industry makes free use of American Indian words and images to describe its teams.

VOA: special.2009.11.13

Positively,what they did there was bring together the best minds bring them together with a mission of saving the free world.

积极地说，他们汇集了最优秀的人才,联合他们，共同拯救自由世界。

哈佛公开课 - 幸福课课程节选

A military spokesman told VOA that the army hoped to free all civilians trapped in rebel territory by Sunday.

VOA: special.2009.05.16

Shouldn't individuals be free ? to choose for themselves their own plans of life ? wherever it may take them?

难道不应让个人自由选择,他们自己的人生计划吗,无论结果会如何？

耶鲁公开课 - 政治哲学导论课程节选

She made each hand as an example to students while she was teaching a class on drawing using free-motion embroidery.

VOA: special.2009.11.04

These women are not free to move around, particularly those who are required by their religious community to remain in their homes and only go outside perhaps with their chaperon.

这些女性不能自由行动，特别是,那些受到宗教团体要求的女性,必须待在家中，最多只能,在监护人的陪同下外出。

普林斯顿公开课 - 人性课程节选

The man was John Brown. John Brown heard that five Free State men had died in the attack on Lawrence.

VOA: special.2009.05.07

They will be made available free to the public via the internet, so this is a way of allowing the world to benefit from what we all do at Yale.

它们会通过互联网向公众免费开放，这样全世界的人都能从耶鲁的课程中有所收获,我们要做的。

耶鲁公开课 - 1945年后的美国小说课程节选

School administrators point out that the texts may be free online, but students need a way to access them.

VOA: special.2009.08.27

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

It led the sculptor Felix de Weldon to create one of the largest free-standing bronze statues in the world.

VOA: special.2011.05.30

God's preference for the offering of Abel valorizes the free life of the nomadic pastoralist over urban existence.

上帝对亚伯的优待，肯定了游牧式的生活,甚于定居的生活。

耶鲁公开课 - 旧约导论课程节选

I believe the declaration that "all men are created equal" is the great fundamental principle upon which our free institutions rest;

VOA: special.2009.02.09

There is in us at least an element that is free, independent, serving nothing, autonomous.

我们的人性中至少还有一种元素，它是自由的，独立的，而且不依据其他事物存在而存在。

耶鲁公开课 - 文学理论导论课程节选

But a lot of that market has moved to free or low-cost advertising on the Internet, including sites like Craigslist.

VOA: special.2009.03.21

So I always felt free, in fact, I felt encouraged when I had a disagreement to step forward and make my case.

所以我总觉得很自由，事实上，我觉得经常被鼓励提出不同意见,站出来，陈述自己的观点。

普林斯顿公开课 - 国际座谈会课程节选

In time,however, there was another reason to fight: to free the black people held as slaves in the South.

VOA: special.2009.10.08

We are physical objects that labor under the illusion that we have free will, but after all, free will isn't something that you can just see, right?

我们生活在人有自由意志,这样的错觉下,但毕竟,自由意志不是那种可以看得到的东西,对吧

耶鲁公开课 - 死亡课程节选

Under the law of nature, I'm not free to take somebody else's life or liberty or property, nor am I free to take my own life or liberty or property.

根据自然法，我不能随意剥夺他人的生命，自由或财产，也不能随意剥夺自己的生命，自由或财产。

耶鲁公开课 - 公正课程节选