a girl balances on one leg, holding her foot and glowering at a blushing boy, while another young couple dance in the background.

VOA: standard.2010.08.09

Let me give a little bit background on positive psychology: how we came about and how this class came about.

下面介绍一下积极心理学的背景：,它是如何诞生的，这门课是如何诞生的。

哈佛公开课 - 幸福课课程节选

So, let me begin by doing a little bit of background so you know what's going on here.

首先，我要做一下背景介绍,你们就能了解情况了。

麻省理工公开课 - 固态化学导论课程节选

And,each player's observations and interactions with the local people vary greatly, depending on his background.

VOA: standard.2009.11.05

So if you're coming from prior background, your code might work a little differently on a different system if you don't use those flags.

如果你来自一个先前的背景，如果你们没有使用这个版本标志的话，在一个不同的系统中,你的代码可能运行地不太一样。

哈佛公开课 - 计算机科学课程节选

"We think that you ought to have a background check at gun shows. We think you ought to have a background check so that people who are dangerously mentally ill aren't getting their hands on guns."

VOA: standard.2010.04.19

All right. With that by the way of background, let's go on to two -what we might call rhythmic devices here--two rhythmic devices.

以此为背景知识,我们来继续学习,两种节奏类型

耶鲁公开课 - 聆听音乐课程节选

"President Obama, based on an earlier story,had asked that the national security team gather further information on his background, including concerns that he might have been involved the deaths of a significant number of Taliban prisoners of war a few years ago.

VOA: standard.2009.08.17

Study at their views and I think what I'm talking about is really completely different, I have no sympathy for ideas that say we want to get rid of people because their racial background or because in somewhere they are blot on the Aryan folk.

我也研究了他们的观点，然而我觉得,我的学说和纳粹是全然不同的,我并不赞同他们的说法，那就是,我们要消灭一些民族，只因为他们不同的宗教,因为他们在雅利安传说中的,不良形象。

普林斯顿公开课 - 人性课程节选