A radioactive element of the actinide series, atomic number 94, which is a silvery, reactive metal, first produced artificially from uranium in…
| 单词 | θ68897 |
| 释义 | the world > matter > chemistry > elements and compounds > metals > specific elements > plutonium > [noun] (1) plutonium1942 A radioactive element of the actinide series, atomic number 94, which is a silvery, reactive metal, first produced artificially from uranium in… |
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