该方法巩固了对于我在能量和营养流的研究，并结合了自然丰度和浓缩同位素跟踪技法。
This approach underpins much of my research on energy and nutrient flux, and has involved both natural abundance and enriched isotope tracing techniques.
为将燃料做成电能反应堆，铀被浓缩至U-235同位素含量5%以下。
To make fuel for electricity-generating reactors, uranium is enriched to less than 5 percent of the isotope U-235.
根据新协议，一年内，伊朗将向土耳其输送1200千克储备低纯度浓缩铀以交换其120千克浓缩铀（纯度约20%）用以生产药用（特别用于癌症的治疗）同位素的研究用反应堆。
Under the new deal, Iran says it would send 1,200 kg of its stockpile of low-enriched uranium to Turkey.
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