Drawing from the work of physicists Enrico Fermi and Leo Szilard… Einstein warned of a nuclear chain reaction in a large mass of uranium.

根据物理学家恩里科·费米和利奥·西拉德的研究，爱因斯坦警告说，在大量铀中会发生核连锁反应。

And the idea almost like a nuclear chain reaction of one piece of debris hitting another piece of debris and a cascade.

这个想法几乎就像一块碎片撞击另一块碎片和级联的核连锁反应。