DSN文件: ( a9 F8 |4 G$ W6 e" [, C" [, tA design file (.dsn) ontains design data generated by the PCB Editor. It includes complete information about components, connectivity (netlist) and design constraints. This file serves as the starting point for all work in the PCB Router. " U: H# D1 V- }1 CSES文件: % Y1 C. H. J) v) G* x+ tA session file (.ses) contains design data generated by the PCB Router. It includes a nearly complete record of all commands and activities that were executed during a design session. 0 a6 b- O$ f. [! i S* M# W看不懂英文的再问。