将igs文件导入LT出现以下问题: i[\u-TF
2[&-y[1
*** Error (AITX_BLANKED_ENTS) *** Cbg#Yz~/
D:vUy*
The input file did not contain any supported non blanked independant entities. {i}Q}OgYq
g#%FY1xp
Please check the documentation for a list of supported entities. L8tLW09
s1\BjSzk
请教各位是什么原因,如何解决?