放射性沉降物中含有非天然的重元素和同位素。
The fallout contained heavy elements and isotopes not found in nature.
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 .
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