常見例句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. 一種軟質(zhì)、銀白色、放射性四價金屬元素，同位素用作核反應能源，見於釷鑛和獨居石沙中。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 一種軟質(zhì)、銀白色、放射性四價金屬元素，同位素用作核反應能源，見於釷鑛和獨居石沙中 返回 thorite