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。