Mr. davies said the u. s.believes pyongyang may have already developed uranium-enrichment facilities beyond the one site it showed a visiting american scientist , siegried hecker , last month .

戴维斯说，美国认为，除了上个月向到访美国科学家赫克（siegfriedhecker）展示的那座以外，朝鲜可能还已经建成了其他铀浓缩设施。

Mr. hecker didn 't respond to several messages left at his office and home .

赫克没有回复记者发往他办公室和住所的多条留言。

Siegfried hecker , a co-director of stanford university 's centre for international security and cooperation who has made several visits to north korea 's nuclear facilities , said the nuclear test appeared to be aimed at fixing problems pyongyang 's technicians encountered in their first test in october 2006 .

斯坦福大学国际安全和交流中心的主管siegfriedhecker曾几次访问朝鲜的核设施，他认为朝鲜这次的核试验可能是为了解决工程师们在2006年10月第一次核试验时碰到的问题。

Siegfried hecker , a us nuclear scientist who has visited north korea 's atomic facilities repeatedly , says it probably needs to make one more atomic test in addition to those conducted in 2006 and 2009 to be able to miniaturise a warhead for deployment on a missile .

曾多次访问朝鲜核设施的美国科学家西格弗里德赫克尔（siegfriedhecker）表示，朝鲜很可能还需要进行一次核试验（朝鲜曾在2006年和2009年进行核试验），才能掌握核弹头小型化技术，使该国的导弹能够配备核弹头。

The u. s. dispatched mr. bosworth in the aftermath of a new report by stanford scientist siegfried hecker over the weekend revealing the north 's new uranium-enrichment capabilities following a trip to pyongyang .

斯坦福大学（stanforduniversity）科学家赫克（siegfriedhecker）访问平壤归来后，上周末发表了一篇新论文，文中展示了朝鲜全新的铀浓缩能力。