The annexe said Iranian scientists had engaged in "probable testing" of explosives arranged in a hemisphere, which is how an implosion-type nuclear warhead is triggered.
这份附件称，伊朗科学家可能已经进行了一项在半球内的爆炸测试，这正是内爆型核弹头引爆的方式。
2
Its nuclear warheads use an implosion design with a solid core of about 15-20 kilograms of highly enriched uranium.
它的核弹头使用爆炸设计有一个由约15 - 10千克高纯度浓缩铀组成的实核。
3
The massive implosion at the Yongbyon facility is intended to be a powerful public symbol of a move to end nuclear activities by the nation.