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1.This is the first actinium series of reactors we've built.
这是我们建造的第一台铀系列反应堆。
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2.The actinium series reactor is a powerful tool for nuclear energy research.
铀系列反应堆是核能研究的强大工具。
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3.The actinium series reactor has been used in many countries around the world.
铀系列反应堆已被世界上许多国家使用。