稳定的电绝缘性，降低阴极保护电流。
Stable electric insulation to reduce cathodic protection current.
电流不能通过绝缘体。
在绝缘体中测定通过的电流是很困难的。
It is very difficult to measure the passing current in insulators.
电流不能通过绝缘体，如同水不能通过铁块一样。
The electric current cannot go through an insulator, just as water cannot go through iron.
电流不能通过绝缘体，如同水不能通过铁块一样。
The electric current cannot go through an insulator, just as water cannot go through iron.
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