spontaneous radiation

例句：

1. 1.Scientists have long been studying the phenomenon of spontaneous radiation.
   科学家一直研究自发辐射现象。
2. 2.The study of spontaneous radiation has led to many important discoveries in physics.
   自发辐射的研究在物理学中导致了许多重要的发现。
3. 3. In this experiment, we will observe the spontaneous radiation from a radioactive source.
   在这个实验中，我们将观察放射性源的自发辐射。