将igs文件导入LT出现以下问题: m>*A0&??[
(giTp@Tp
*** Error (AITX_BLANKED_ENTS) *** P- `~]]
'Tru?y\
The input file did not contain any supported non blanked independant entities. @qO8Jg"Q
!UgUXN*
Please check the documentation for a list of supported entities. iX>!ju'V
Jm);|#y
请教各位是什么原因,如何解决?