a radioactive metallic element that is similar to tellurium and bismuth; occurs in uranium ores but can be produced by bombarding bismuth with neutrons in a nuclear reactor
例句
用作名词(n.)
Polonium is used to set off a nuclear bomb.钋被用来引爆炸弹。
Polonium is a naturally radioactive metallic element.钋是一种具有天然辐射性的金属元素。
