insulator
/ˈɪnsjʊleɪtə(r)/noun
1- a thing or substance used for insulation, in particular隔离物, 尤指：
1.1
- a substance which does not readily allow the passage of heat or sound隔热物; 隔音物：
cotton is a poor insulator.
棉花隔热性能差。
1.2
- a substance or device which does not readily conduct electricity绝缘体; 绝缘装置。
1.3
- a block of material, typically glass or ceramic, enclosing a wire carrying an electric current where it crosses a support绝缘子。