If answering that question was necessary to speaking and understanding the language fluently, it wouldn't be so hard to answer the question. Mapping concepts between two languages is much, much harder than simply speaking and understanding both languages.
Right, and that's part of the problem. The whole culture and language are so alien to most people that it is incredibly hard to map concepts.
As far as I can tell the only non-native speaker who is actually fluent is Daniel Everett. Given that the language is the subject of a fair amount of linguistic interest because of its uniqueness, it's pretty amazing that he is the only one.
Not only that, but even with a natural aptitude for languages and desire to learn, it took him 7 years of living with them to get to that point.
