| 释义 |
rare-earth element AHD[râr'ûrthʹ] D.J.[ˌreərˈɜːθ]K.K.[ˌrɛrˈɝθ]n.（名词）- Any of the abundant metallic elements of atomic number 57 through 71. Also called lanthanide 稀土元素：原子序数在五十七至七十一之间，有大量储存的金属元素中的任意一种 也作 lanthanide
- So called because they were originally thought to be rare 由于开始时它们被认为数量稀少，所以这样命名
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