将igs文件导入LT出现以下问题: >-`-D=!V
JVPLE*T
*** Error (AITX_BLANKED_ENTS) *** /9-kG
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The input file did not contain any supported non blanked independant entities. 2>Kn'p
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Please check the documentation for a list of supported entities. P>*`<$FR
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请教各位是什么原因,如何解决?