gammacross

例句：

1. 1. The gamma-ray crossover is a rare event in the universe.
   伽马射线交叉是宇宙中罕见的事件。
2. 2.The gamma-ray crossover has been studied for decades to understand its effects on the environment.
   伽马射线交叉已经研究了几十年，以了解其对环境的影响。
3. 3.In this experiment, we observed a gamma-ray crossover that occurred when the beam was directed through a filter.
   在这个实验中，我们观察到了一个伽马射线交叉现象，当光束通过过滤器时发生。