将igs文件导入LT出现以下问题: {e"dm5
nls
*** Error (AITX_BLANKED_ENTS) *** po7>IQS]
'#.#$8l
The input file did not contain any supported non blanked independant entities. =n+ \\D
2'] KTHm
Please check the documentation for a list of supported entities. |gx~gG<
,[e\cnq[
请教各位是什么原因,如何解决?