英语词汇rare-earth element怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	rare-earth element
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 Etymology语源 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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