Radium is a radioactive element.
镭是一种放射性元素。
Radioactive Element Detected Near Nuclear plant.
核电站附近发现辐射性元素。
Radium is a radioactive element.
镭是个放射性元素。
Because you have to know how much of radioactive element you have in those systems.
因为你必须知道有多少放射性元素在这些系统中。
Because you have to know how much of radioactive element you have in those systems.
因为你必须知道有多少放射性元素在这些系统中。
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