Electric current cannot go through insulation.
电流不能通过绝缘体。
You cannot go through life without any aim at all.
你不能毫无目的地混一辈子。
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.
电流不能通过绝缘体，如同水不能通过铁块一样。
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