Iran has rejected the December 31 deadline set by the international community to accept a deal to enrich its uranium overseas.

VOA: standard.2010.01.04

I think it's also the struggle of a generation trying to enrich the public square with positive conversation about religion.

我认为这也是我们这一代人的努力,我们试图通过积极地谈论宗教,来丰富社会生活。

普林斯顿公开课 - 人性课程节选

So this is an experiment of using an online distance product to enrich what was from a content standpoint that our students recapped.

因此，这个实验,用网上远程产品充实了,同学们反复阐述的,内容观点。

麻省理工公开课 - 媒体、教育、市场课程节选

"Last November,Iran announced that it would build In February, Iran said that it would begin to enrich uranium to nearly 20 percent-moving,closer to weapons-grade material."

VOA: standard.2010.06.09

Is to say, okay now let's try to enrich the model, to add more into the model, and see if you get a different result, and if so why?

好吧,那我们就来完善这个模型吧,给这个模型加入新的约束条件,看看会不会得到不同的结果,如果是再分析原因

耶鲁公开课 - 博弈论课程节选

The international community is worried that Tehran is planning to install a new generation of sophisticated centrifuges to enrich uranium at a much faster pace.

VOA: standard.2009.10.24

Separately,EU foreign policy chief Javier Solana reacted cautiously to reports that Iran would accept the broad lines of a UN proposal to enrich Iranian uranium overseas but only if "important changes" were made.

VOA: standard.2009.10.27

Friday,Tehran delayed its response to a proposal made by the US, France and Russia to further enrich Tehran's existing stockpile of low-grade uranium.

VOA: standard.2009.10.24

It is also important to secure nuclear materials in countries that enrich uranium for fuel.

VOA: standard.2010.08.06

Under the scheme, Russia would further enrich the uranium to the 20 per cent purity needed for use in a research reactor in Tehran which produces medical isotopes but is running out of fuel.

VOA: standard.2009.10.24