43号元素的放射性使其易于分离和测量。
Element 43's radioactivity makes it easy to isolate and measure.
因为它的重，所以你想它应该是放射性元素。
镭是一种放射性元素。
重元素中的大量放射性同位素分别属于三个系列。
A large number of radioactive isotopes among the heavy elements are of three series.
重元素中的大量放射性同位素分属于三个系列。
The large number of radioactive isotopes among the heavy elements fit into three series .
镭是个放射性元素。
镭和铀是放射性元素。
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。
Because you have to know how much of radioactive element you have in those systems.
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