星期一，一列装载着核弹级铀材料的专列到达了一处俄罗斯的安全设施。这些核材料来自波兰的一个研究用的反应堆，运送它们，是为了确保世界各地的危险的放射性物质安全的努力的一部分。

A shipment of bomb-grade uranium arrived at a secure facility in Russia on Monday, sent from a research reactor in Poland as part of a race to secure dangerous radioactive material around the world.

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装载此类物质的条件是什么？

PSCO: What is the condition of carrying such substances?

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