天然辐射是人类所受辐射照射的主要来源，远大于用于和平目的所有核设施带给全世界人口的辐射照射量。
For human beings, natural radiation is the main source of radiation. It is much more than the radiation exposure from all nuclear facilities for peaceful purposes.
在保证核设施的安全方面哪个国家应该承担主要责任？
Which country will take the lead in securing nuclear materials?
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