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.
该研究算出，这一工厂已经生产了大约6吨军用的或90%浓度的浓缩铀。
The study calculates that the plant has facilitated about six tonnes of weapon-grade or 90% enriched uranium.
我们故意把这种墨水保持低浓度，并把它置于精确控制的温度下外露于空气中，这样流体上表面破浪地方的黄金颗粒就能得到浓缩。
The ink was kept deliberately thin and exposed to air at a precisely controlled temperature, which concentrated the gold particles at the curved upper surface of the fluid.
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