So the Castle Bravo bomb is the largest nuclear weapon ever tested by the United States.

因此，“欢呼城堡”炸弹是美国迄今为止试验过的最大的核武器。

Washington's envoy on North Korea says Pyongyang's fifth nuclear weapons test requires a swift and strong response including fresh sanctions.

华盛顿驻朝鲜特使表示，平壤第五次核武器测试需要快速而强烈的反应，其中包括新的制裁措施。

United States says North Korea may be preparing for a nuclear weapon's test within the next few weeks after a five-year pause.

美国称，在近几周内，朝鲜可能准备进行自五年前暂停试验以来首次核武器试验。

South Africa denied it planned to carry out a nuclear weapons test.

南非否认计划进行核武器试验。

But on top of all this, the FFT was discovered by scientists trying to detect covert nuclear weapons tests.

但除此之外，FFT 是由试图探测秘密核武器试验的科学家发现的。

China is North Korea's oldest ally, but the relationship has been frosty for years, especially after multiple North Korean nuclear weapons test and missile launches were all banned by the United Nations.

中国是朝鲜的老盟友，但多年来，双方关系一直冷淡，尤其是在朝鲜多次进行核武器试验和导弹发射之后，联合国都禁止朝鲜发射导弹。