spontaneous discharge

例句：

1. 1.The electrical sparks during the experiment were due to a spontaneous discharge of electricity in the circuit.
   实验中的电火花是由于电路中自发的电流放电造成的。
2. 2.The scientist observed that the spontaneous discharge of electrons caused the arc to glow brightly.
   科学家观察到，电子的自发放电导致电弧发出明亮的光。
3. 3. In the early days of the electric power industry, there was much debate about whether the spontaneous discharge of electricity could be controlled or not.
   在电力工业的早期，关于是否能控制电流的自发放电有很大的争论。