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词汇 atomic number 90
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
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