OK I see what you mean in that it may be a little difficult unless you employ a Chinese moderator, but Hong has a point in that while different people speak different dialects there is just one written language. Interestingly it was the old emperors who developed this system as a means of controlling the people as I understand it. However I digress it still seems that there would be quite large numbers of aviators in the domestic markets of Mainland China/Taiwan to whom this would be useful.