self-excitation phenomena

例句：

1. 1. The self-excitation phenomena in the system are crucial for its stability.
   系统中的自激现象对于其稳定性至关重要。
2. 2.The researcher found that the self-excitation phenomena were caused by a sudden change in the environment.
   研究人员发现，自激现象是由环境突然变化引起的。
3. 3.In the experiment, the self-excitation phenomena were observed to occur at different frequencies.
   在实验中，观察到自激现象在不同频率下发生。