科学家一直在寻找更简单的方法制造名为浓缩铀的昂贵材料- - - - - -核反应堆和炸弹的燃料，现在只在大型工厂生产。
Scientists have long sought easier ways to make the costly material known as enriched uranium - the fuel of nuclear reactors and bombs, now produced only in giant industrial plants.
核项目中技术难题是生产核反应堆的燃料。
尤其必须立即采取行动，执行有关用伊朗自己提炼的低浓度浓缩铀为德黑兰作研究用的反应堆提供燃料的计划——该反应堆用于生产医用同位素。
In particular, prompt action is needed on implementing the plan to use Iran's own low-enriched uranium to refuel the Tehran research reactor, which is used to produce medical isotopes.
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