graded insulator

例句：

1. 1. The new graded insulator is more durable than the old one.
   这款新型分级绝缘体比旧款更耐用。
2. 2. The engineer used a graded insulator to improve the electrical conductivity of the circuit.
   工程师使用分级绝缘体来提高电路的电导率。
3. 3. The graded insulator was designed to reduce the risk of electrical shocks during lightning storms.
   分级绝缘体的设计旨在减少雷暴期间触电的风险。