There is no mysticism in translation loss. A sentence has a meaning in a given cultural frame, and any attempt to transpose it in an other frame will face hard or even unachievable constraints.

Just like, if you don't have the background to understand an adhoc private joke, having later some full length explanation will not necessarily make you laugh as you might have if you had these information upstream. In case of translation, your lake of information might be the whole cultural frame that encompasses the language.