Iran has sent mixed signals about its response to the plan, under which much of the low-enriched uranium Iran has produced in its controversial enrichment program would be shipped abroad for processing, a step that would ease Western concerns about Iran's nuclear intentions.

VOA: standard.2009.11.09

It's very important in the biological operation of human cells and that step is RNA splicing, or processing of this RNA, single stranded RNA that's produced by transcription.

而这对人类细胞生物运作至关重要,这个步骤就是RNA剪接,或者说是对RNA的加工,对转录出的单链RNA进行加工的步骤

耶鲁公开课 - 生物医学工程探索课程节选