high voltage insulating oil

例句：

1. 1.This high voltage insulating oil is used to protect electrical equipment from overheating.
   这种高压绝缘油用于保护电气设备免受过热。
2. 2. The engineer carefully filled the high voltage insulating oil into the transformer.
   工程师小心地将高压绝缘油填充到变压器中。
3. 3. During maintenance, the technician had to replace the high voltage insulating oil with fresh ones.
   在维护期间，技术人员必须用新鲜的高压绝缘油替换旧的。