将igs文件导入LT出现以下问题: V&oT':%q
U\8#Qvghf
*** Error (AITX_BLANKED_ENTS) *** A4Q)YY9~
.(1j!B4^
The input file did not contain any supported non blanked independant entities. !en F8a
+R#`j r"
Please check the documentation for a list of supported entities. pu$XUt
n{Qh8"
请教各位是什么原因,如何解决?