actinium
n.锕
网络解释.锕；锕之母；锕系；锕系元素
双语例句
1. 1 . Any of a series of chemically similar, radioactive elements with atomic numbers ranging from 89 ( actinium ) through 103 ( lawrencium ).
锕类任何化学性质相似, 原子序数在89 ( 锕 ) 与103 ( 铹 ) 之间变化的放射性元素.
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