And then they have one more plutonium core.

他们还有一个钚核。

A 6 kilogram plutonium core, 13.5 pounds, that's the one they first test at Trinity.

一个 6 公斤重的钚核，13.5 磅，这是他们在三一测试中首次测试的。

The goal is to have this sit right around the plutonium core in the middle of the bomb.

目标是让它正好位于炸弹中间的钚核心周围。

The bomb detonated in the air, but fortunately its plutonium core had been removed prior to the flight so it didn't cause a nuclear explosion.

炸弹在空中引爆， 但幸运的是， 它的钚核在飞行前已被移除，因此没有引起核爆炸。