A rare, highly radioactive, metallic chemical element, atomic number 84, present in some uranium ores, the longest-lived isotope (polonium-209)…
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| 释义 | the world > matter > chemistry > elements and compounds > metals > specific elements > polonium > [noun] (1) polonium1898 A rare, highly radioactive, metallic chemical element, atomic number 84, present in some uranium ores, the longest-lived isotope (polonium-209)… |
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