coil insulation

例句：

1. 1. The new transformer uses a special type of coil insulation to improve efficiency.
   新型变压器使用特殊类型的绕组绝缘来提高效率。
2. 2. The technician carefully inspected the coil insulation for any signs of wear or damage.
   技术员仔细检查了绕组绝缘，以查找任何磨损或损坏的迹象。
3. 3. Due to the high voltage requirements, the coil insulation must be very thick and durable.
   由于高电压要求，绕组绝缘必须非常厚且耐用。