Why the shell part which i built in Rhino don't show up in Cura?

[Dainel 0]

just the solid part remarked by green circle shows up, the other shell part denoted by red rectangle don't show up.

Besides this, the solid part which i built in Rhino just become hollow.

[Smithy 1,144]

For 3D printing you need a watertight model and I am sure your STL is not watertight. Therefore the left part is hollow and not solid. 

 

For the shell on the right side you need a wall thickness which your printer is able to print, so usually 0.4mm. If you just have a "line" there, it will not work.