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
造句
用作名詞(n.)
Polonium is used to set off a nuclear bomb. 釙被用來(lái)引爆炸彈。
Polonium is a naturally radioactive metallic element. 釙是一種具有天然輻射性的金屬元素。