nonconductor

名词 nonconductor:

1. a material such as glass or porcelain with negligible electrical or thermal conductivity
   同义词：insulator, dielectric

non.con.duc.tor

n.（名词）
A material that conducts little or no electricity, heat, or sound.
非导体：仅能在很小的程度上或不能传导电、热或声音的物质