将igs文件导入LT出现以下问题: 69 R8#M
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*** Error (AITX_BLANKED_ENTS) *** q3B#rje>h
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The input file did not contain any supported non blanked independant entities. c-!rJHL`
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Please check the documentation for a list of supported entities. &""~Pn8
tB4- of3+
请教各位是什么原因,如何解决?