没有绝对的绝缘体也没有绝对的导体，因为一切物体对电流都有阻力。
There exist neither perfect insulators nor perfect conductors, for all substances offer opposition to the flow of electric current.
没有绝对的绝缘体也没有绝对的导体，因为一切物体对电流都有阻力。
There exist neither perfect insulators nor perfect conductors, for all substances offer opposition to the flow of electric current.
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