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单词
atomic number 61
释义
atomic number 61
(extremely rare)
n
WORD FAMILY
atomic number 61
n
a soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium
Syn
|
Hyper
Pm, promethium
metal, metallic element
any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
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更新时间:2025/7/22 17:23:25