单词 | promethium |
释义 | pro·me·thiumBrE /prəˈmiːθiəm/ NAmE /prəˈmiːθiəm/ noun [U ] (symbol Pm ) a chemical element . Promethium is a radioactive metal that was first produced artificially in a nuclear reactorand is found in small amounts in nature 钷(放射性化学元素) |
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