Also since 2010 , eight countries removed or disposed of 480 kilograms of heu , enough to make about 19 atomic weapons .

自2010年以来，还有八个国家完全清除或处理了480公斤高浓缩铀，这些高浓缩铀足以制造19枚左右的核武器。

U. s. energy secretary steven chu emerged from the meeting twice to explain different agreements washington made to help south korea and several european countries with conversion of heu to low-enriched uranium .

美国能源部长朱棣文（stevenchu）两次在会议中站出来，讲解华盛顿为帮助韩国和数个欧洲国家将高浓缩铀转化为低浓缩铀而达成的不同协议。

But russia , which has the second-largest heu stockpile after the u. s. , disappointed u. s.officials and other participants by not making any new offers to convert heu-based nuclear reactors .

不过，俄罗斯令美国官员和其他与会者感到失望，因为该国没有就改造使用高浓缩铀的核反应堆提出新举措。