Originally: any of various naturally occurring oxides of elements of the lanthanide series (or †of other metallic elements). Later (now usually)…
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| 单词 | θ69186 |
| 释义 | the world > matter > chemistry > elements and compounds > metals > [noun] > groups > lanthanides > compounds (1) rare earth1863 Originally: any of various naturally occurring oxides of elements of the lanthanide series (or †of other metallic elements). Later (now usually)… |
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