将igs文件导入LT出现以下问题: -`rz[";n
6n>+cX>E
*** Error (AITX_BLANKED_ENTS) *** GLEGyT?~
grv 3aa@
The input file did not contain any supported non blanked independant entities. Zu5`-[mw
UA{A G;
Please check the documentation for a list of supported entities. 6Z7{|B5}Y
P}cGWfj
请教各位是什么原因,如何解决?