She gave a free concert in the open air, near the Lincoln memorial.

VOA: special.2009.01.25

But thankfully now in 2010, we're at the point where there's a whole lot of free and open source software that you can integrate into your projects that other nice people have made available.

不过幸好在2010年,现在有很多可用的开源,代码软件，你可以将其融合,到你的工程中。

哈佛公开课 - 计算机科学课程节选

Paradise Lost as a whole clearly wants us to believe that God has foreknowledge and it also clearly wants us to believe that we have free will, but the similes seem just as often to open up and to question the poem's doctrinal conclusions.

整体来说很清楚地是想让我们相信,上帝具有先知的能力,并且还想让我们相信人生来有自由的意志，但是这些比喻看起来只是为我们揭露,并质疑了诗歌本身的学理上的总结。

耶鲁公开课 - 弥尔顿课程节选

Chairman Genachowski says a "free and open Internet" must be safeguarded.

VOA: special.2009.09.25

APEC aims to have free and open trade and investment among all their members by the year 2020.

VOA: standard.2009.11.08