求翻译：）三维模型的近似处理。由于产品往往有一些不规则的自由曲面，加工前要对模型进行近似处理，以方便后续的数据处理工作。由于STL格式文件格式简单、实用，目前已经成为快速成型领域的准标接口文件。它是用一系列的小三角形平面来逼近原来的模型，每个小三角形用3个顶点坐标和一个法向量来描述，三角形的大小可以根据精度要求进行选择。是什么意思？

Approximate) three-dimensional model. The products tend to have irregular free surface, prior to processing the model approximation in order to facilitate subsequent data processing. Stl format file format is simple, practical, has now become a quasi-standard in the field of rapid prototyping interf

) the approximate 3D models. Because of the product there are some rules are not curved, and the freedom to be processed before the model approximated the follow-up to facilitate data processing. Since STL format file format simple, practical, and has now become a form of the Icon Interface file. It

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)-Dimensional model approximation. Because the products often are some irregular surface, before processing to approximate your model, to facilitate the work of subsequent data processing. As the STL format file format is simple, practical, has now become the standard interface file in rapid prototy

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