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单词 rare-earth element
释义
rare-earth element (rârûrth)
n.
Any of a group of 17 naturally occurring metallic elements that have similar properties, consisting of scandium, yttrium, and the 15 elements with atomic numbers 57 through 71 (the lanthanides). The rare-earth elements are widely used in electronics and other high-tech products.

[RARE EARTH.]
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