Radium and uranium are radioactive elements.

镭和铀是放射性元素.

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The rate at which radioactive elements disintegrate varies from one element to another.

放射性元素的衰变速度随元素种类的不同而不同.

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Petrographically and mineralogically similar rocks quite often have different concentrations of radioactive elements.

岩石学矿物学上类似的岩石,其放射性元素丰度却往往有所不同.

辞典例句

Radioactive elements are at the normal background level, causing no deleterious pollution.

环境辐射在正常范围之内, 不存在任何人为造成的放射性污染.

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How many radioactive elements do you know?

你知道多少种放射性元素?

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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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