The event has added symbolism this year, coming against the background of Israel's rejection of demands by the United States to stop building in disputed East Jerusalem.

VOA: standard.2010.04.01

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

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

Let's go back to high school for a moment, just by way of background.

让我们回到高中，去寻找一些相关背景。

麻省理工公开课 - 固态化学导论课程节选