The story begins, in a sense, in classrooms around the world, where students are taught that the rate of decay of a specific radioactive material is a constant.
这个事情要从世界各地的教室里说起，在那里学生学习到特定核素的衰变速率是恒定的。
The concept of heat threshold is brought forward for the melting process of radioactive source with constant heat rate.
针对恒释热率热源接触熔化，提出了热量阈值的概念。
The concept of heat threshold is brought forward for the melting process of radioactive source with constant heat rate.
针对恒释热率热源接触熔化，提出了热量阈值的概念。
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