And this is how, say, a uranium bomb would work.

这就涉及到铀弹的工作原理。

So they placed a uranium bomb in a utensil near a bridge.

于是他们把一颗铀弹放进桥边的一个器具里。

After Japan refuses to surrender unconditionally, the United States drops two atomic bombs on the country a uranium bomb on Hiroshima and a plutonium one on Nagasaki.

在日本拒绝无条件投降后，美国向该国投下了两颗原子弹， 一颗在广岛投下了铀弹， 在长崎投下了一颗钚弹。