It threatens to rebuild Yongbyon and start making weapons-grade plutonium again.
它威胁说要重建宁边核设施并重新开始制造武器级别的钋。
Accounting has since improved, and the country is now thought to have around 145 metric tons of weapons-grade plutonium.
会计方面已经得到改善，国家目前大概有核武原料的145公吨的钚。
In a major and welcomed development, Russia announced that it will close its last weapons-grade plutonium production reactor.
一项重大、颇受欢迎的进展是俄罗斯宣布将关闭最后一座武器级钚生产反应堆。
Much of this remains dangerous for thousands of years, and a proportion of it can be used to produce weapons-grade plutonium.
废弃物的放射性危险会延续数千年，而且部分还可以用来生产武器级放射性元素钚。
According to the Belfer Centre at Harvard University, there is around 1.6m kg of highly-enriched uranium and 0.5m kg of weapons-grade plutonium in the world.
据哈佛大学贝尔弗尔科学与国际事务研究中心的估计，全球大约有160万千克的高浓缩铀，以及50万千克的武器级钚。
The United States and Russia signed an agreement to dispose of sixty-eight tons of weapons-grade plutonium. They plan to use the plutonium as fuel for civilian nuclear reactors.
美国和俄罗斯签署协议，计划处置68吨武器级放射性钚，将其做为民用核反应堆的燃料。
The United States and Russia signed an agreement to dispose of sixty-eight tons of weapons-grade plutonium. They plan to use the plutonium as fuel for civilian nuclear reactors.
美国和俄罗斯签署协议，计划处置68吨武器级放射性钚，将其做为民用核反应堆的燃料。
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