Grado utilizes a special processing method to increase the material's porosity.

歌德采用了特殊的处理方法来提高材料的孔隙度。

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EDM (Electro Discharge Machining) is one kind of special processing method, and it is widely used in mechanical area.

电火花加工属于一种特殊的加工方式，在机械加工领域中逐渐得到了广泛的应用。

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Waterjet cut is one of the processing methods, it and the emergence of electron beam processing, ultrasonic machining method is called special processing method.

水射流加工就是其中的一种加工方法，它和新出现的电子束加工，超声波等加工方法被称为特种加工方法。

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