The Class President believes that the size of the boobs and intelligence are inversely proportional, so she thinks Galko is living a very carefree life.
But, she changes her mind when she sees the bulletin board Galko was intensely staring at.
I bet it's very thorough and deep.
لا بدّ أنّها عميقة ودقيقة
Der ist sicher sehr durchdacht
und tiefgründig.
Has escrito algo muy serio y profundo, ¿no?
Scommetto che è profondo e molto ben fatto!
Imagino que seja muito 
profundo e bem pensado.