它可以在超导体（一种能导电的材料）和绝缘体（一种不导电的材料）之间转变。
It can change between a superconductor a material that conducts electricity, and an insulator a material that doesn't conduct electricity
绝缘层：涂于电极或挂具的某一部分，使该部位表面不导电的材料层。
Insulating layer: coating on the electrode or hanging fixture, a part of the surface of the part of conductive material layer.
但由于硬度高、 脆性大、大多数陶瓷材料不导电，传统的机械加工方法难以加工，使用范围受到限制。
However, it is difficult to machine this material in conventional machining methods because of its high hardness and brittleness as well as inconductvity, thus restricting its application area.
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