Blender Import, Graphic Not Showing

Hi everbody, i did something like a spaceship cabin, but when i import it to Unity it won't show some parts, or shows them weirdly. What do i do wrong?
This is Unity.

This is Blender. (Blue is the glass, i have a material in Unity so i just did that to see.)

Inside ( The blue big panel is front.)

 

check your normals
there`s an option inside blender to show the normal orientation in the N menu
check if they are pointing in the right direction, if not, flip them

or you can try to let blender solve this with strg + n in editmode with everything selected


or maybe your material in unity is transparent

 

Thank you, inverting the some parts worked.