柯林斯英汉双解大词典
francium /ˈfrænsɪəm/
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1.
N an unstable radioactive element of the alkali-metal group, occurring in minute amounts in uranium ores. Symbol: Fr; atomic no: 87; half-life of most stable isotope, 223Fr: 22 minutes; valency: 1; melting pt: 27°C; boiling pt: 677°C 钫
双语例句
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Francium is the densest of the Alkali Metals and also radioactive.
钫是碱金属中密度最大的，具有放射性。
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Even Francium's most stable isotope, Francium-223 only has a half-life of 22 minutes.
钫的最稳定的同位素，钫- 223也只有22分钟的半衰期。
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Because Francium is mainly only found synthetically in laboratory research, it has no known use outside of the laboratory.
由于钫主要仅在实验室研究中产生，它在实验室外没有已知的用途。
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