在数据量很大的情况下，使用EXPORT实用程序生成数据交换文件常常要花费很长时间。
Generating the data exchange file using the EXPORT utility is often a lengthy process in the case of large amounts of data.
STL数据文件是快速成型最常用的数据交换文件，STL数据的错误将影响快速成型预处理的进行。
STL data file is used popularly as data exchange file in rapid prototyping. The errors in the STL data will influence on the preprocessing of rapid prototyping.
所用源数据来自CAD或CAG系统的数据交换文件，并经预处理后已消除其中包含的各种错误、误差或二意性信息。
The original data comes from the data exchange files in the systems of CAD or CAG and the existing errors as the indefinite information are deleted through the pre processing.
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