释义 |
atomic number 90 基本英英 英Noun:a soft silvery-white tetravalent radioactive metallic element;isotope 232 is used as a power source in nuclear reactors;occurs in thorite and in monazite sands
Noun: a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands |