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.
一种软质、银白
、
属元素，同位素用作核反应能源，见于钍矿和独居石沙中。
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.
一种软质、银白、属元素，同位素用作核反应能源，见于钍矿和独居石沙中。
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