Hill said the United States is concerned about North Korea's efforts to develop a highly-enriched uranium program, in addition to its plutonium program.
Hill said the United States is concerned about North Korea's efforts to develop a highly-enriched uranium program, in addition to its plutonium program.
希尔说，朝鲜试图发展高浓缩铀项目和钚项目，美国对此非常关切。