How were the heavy elements from iron to uranium made?
从铁到铀的重元素如何形成？
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别属于三个系列。
The large number of radioactive isotopes among the heavy elements fit into three series .
重元素中的大量放射性同位素分属于三个系列。
Elements necessary for plant growth have been leaching out during the heavy rainfall.
植物生长的所需成分被大雨冲掉了。
Elements necessary for plant growth have been leaching out during the heavy rainfall.
植物生长的所需成分被大雨冲掉了。
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