With effect of geopotential and radiation energy, when the interior of the earth continued to melt, the surface of the earth solidified to form the original lithosphere.

当地球内部在重力势能和放射能的作用下继续熔融时，地球表面固化为原始岩石圈。

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According to the original state of raw metal material used in manufacturing, the manufacturing process can be classified as: melt-based process, powder-based process and deposition technology.

按照所用金属原料在制备过程中的状态对多孔金属的制备工艺作了分类介绍，包括基于金属熔体的工艺、基于固态金属粉末的制备方法、基于电或化学沉积的方法。

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