将igs文件导入LT出现以下问题: &%e"9v2`
wItz cY1m
*** Error (AITX_BLANKED_ENTS) *** q<XcOc5
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The input file did not contain any supported non blanked independant entities. oQvFrSz
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Please check the documentation for a list of supported entities. 4(m3c<'P
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请教各位是什么原因,如何解决?