insulator arc-over

例句：

1. 1.The insulator was designed to prevent electrical short circuits.
   这个绝缘体的设计是为了防止电气短路。
2. 2. During the arc-over, the voltage dropped significantly.
   在弧跨过期间，电压显著下降。
3. 3.The engineer carefully monitored the insulator's performance during the arc-over.
   工程师在弧跨过期间仔细监测了绝缘体的性能。