绝大多数金属都是电的良导体，而纸张、空气、玻璃则是良好的绝缘体。
Most metals are good conductors of electricity, while paper, air and glass are good insulators.
在圆柱形绝缘体上沉积一层金属薄膜制成。
This is made by depositing a thin film of metal on a cylindrical insulating support.
在圆柱形绝缘体上沉积一层金属薄膜制成。
This is made by depositing a thin film of metal on a cylindrical insulating support.
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