We also refine naturally occurring radioactive ores to fuel nuclear power plants.

我们也提纯自然出现的放射性矿石来为核能工厂提供燃料。

Next, by focusing on a super radioactive ore called pitchblende, the Curies realized that uranium alone couldn't be creating all the radiation.

接下来， 通过专注于一种叫做沥青铀矿的超级放射性矿石，居里夫妇意识到铀本身不可能产生所有的辐射。