And what's more, take a look at the current state of Mongolia some time - it's a functioning democracy with pretty decent respect for civil liberties and no tendency to invade their neighbors. Yes, there's a long history of semi-nomadic tribes coming out of Central Asia and invading the civilized cultures along the edges of the Eurasian steppes, but that pattern wasn't unique to the Mongols (various Indo-European, Turkic, Tungusic (i.e., Manchu), Magyar and other peoples have played that role over the millennia), and that's been a thing of the past since horse archers became ineffective in war (i.e., once firearms were widespread).
http://en.wikipedia.org/wiki/Languages_of_China#Spoken_langu...
An example of the differences... in Mandarin to say "It is." you would say "Shi de." but in Hangzhou dialect you would say something that sounds like "Zede ye." The adverb "very" is "hen" in Mandarin but sounds like "molaolao" (though colloquially people often just say "mo") in Hangzhou dialect.
The differences between the various dialects are fascinating sometimes radical and they must have developed for many centuries in near isolation from one another to get where they are today.
Though what's also interesting is some of the different languages and dialects in China also have different sentence structures (eg verb placements).
True. The tones are critical in a way that can be very difficult for non-native speakers to grasp. Here are the four tones used with the words mā (mother), má (hemp), mǎ (horse) and mà (to curse) with an extra for ma indicating a question http://www.youtube.com/watch?v=QRkCf6Djprs.
And in that video she pronounces them far clearer than would be used in actual conversation.
Cantonese for example is a Han language.
There are lots of non-mandarin but Han languages, and beside those.there are the languages of non-Han people.
I guess only the "speak well enough" is related to dialects.
The other 30% I think he is referring to people that speak cantonese, and all other interesting languages that exists there, including the mongolian languages (almost everything in China west of the great wall, was originally part of mongolia, like Tibet for example... and thus they have not much to do with China actually, specially Han people).
I hope someday people will figure a way to keep mongolians peaceful without erasing their culture or resorting to extreme tyranny.