Tehran has not,as yet, agreed to the terms of a UN-draft deal to trade for highly enriched uranium from France and Russia.

VOA: standard.2009.12.18

When it cuts it leaves sticky ends or un-base paired single stranded regions on each end of the part its cut and that's just a property of many restriction enzymes; not all, some cut blunt,just right down the middle.

它切割后会留下两个粘性末端,或者未配对的单链部分,这是许多限制性内切酶的特性,但不是全部,有些限制性内切酶是从中间钝切的

耶鲁公开课 - 生物医学工程探索课程节选

For Julia, who is sitting at a nearby table, the magic often happens when life itself seems un-magical.

VOA: standard.2010.02.13

For instance,he says, a UN compound recently was hit by rocket fire, a World Food Program convoy came under attack and non-governmental organizations are frequent victims of armed robbery by criminals.

VOA: standard.2009.08.07

Even though it won a majority of votes in parliament last year, it still faces powerful opposition from leading sheiks, who call the measure un-Islamic, and a bow to Western cultural imperialism.

VOA: standard.2010.03.27

(Sound) Amid loud acclamations of approval, top hardline Iranian cleric, Hojatoleslam Ahmad Khatami warned the West that Tehran will produce its own high-grade uranium for a medical research reactor, if the UN International Atomic Energy Agency refuses to provide the fuel.

VOA: standard.2009.11.28