求翻译：其基本过程是：首先设计出所需零件的计算机三维模型（数字模型、CAD模型），然后根据工艺要求，按照一定的规律将该模型离散为一系列有序的单元，通常在Z向将其按一定厚度进行离散（习惯称为分层），把原来的三维CAD模型变成一系列的层片；再根据每个层片的轮廓信息，输入加工参数，自动生成数控代码；最后由成形机成形一系列层片并自动将它们联接起来，得到一个三维物理实体是什么意思？

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Its unit process is: First designs needs the components the computer three-dimensional model (numerical model, the CAD model), then the basis technological requirement, according to certain rule this model separate for a series of order unit, usually to carries on in Z it according to certain thickn

Its basic process is: first design out by needed parts of computer three dimensional model (digital model, and CAD model), and under technology requirements, in accordance with must of law will the model discrete for series ordered of unit, usually in z to will its by must thickness for discrete (ha

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