a material such as glass or porcelain with negligible electrical or thermal conductivity
同义词：dielectric, nonconductor
insulator例句
Conductors let electricity through, but insulators don't let through.
导体让电流通过，而绝缘体则不让通过。
insulator详细解释
in.su.la.tor n.（名词）A material that insulates, especially a nonconductor of sound, heat, or electricity.绝缘体：绝缘材料，特别是声、热、电的非导体A device that insulates.绝缘装置
