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

And perhaps the explanation has got to be the ubiquity of death is this kind of background, constant hum.

也许应该这么解释，死亡的无处不在,是一种背景的，持续的嗡嗡声。

耶鲁公开课 - 死亡课程节选

So I don't know your mathematical background, but the textbook has an appendix, which is a reasonable measure of how much math you should know.

我不太清楚你们的数学功底,但教材上有附录,它能清楚地告诉你,你应该掌握多少数学

耶鲁公开课 - 基础物理课程节选

Quickly, India and Pakistan, ? How do they get along? Has the prospects for war between the two countries we see is in the background? -Probably yes.

印度和巴基斯坦，它们的关系怎么样,这两个国家间潜在的战争,可能爆发吗？，-也许吧。

普林斯顿公开课 - 国际座谈会课程节选