一位前联合国核检查员说,美国必须向朝鲜施压,要它在任何去核协议中披露包括其刚善(Kangsong)铀浓缩基地在内的所有秘密核设施。Washington must press Pyongyang to reveal the existence of secret nuclear sites, including the second uranium enrichment facility known as Kangsong, in any nuclear disarmament deal, said a former United Nations nuclear inspector.