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Why did Kunming Changshui Airport say "Yunnan dialect is not Northeast dialect"?

Hello.

I think there is no problem with this sentence.

Yunnan dialect is not Northeast dialect.

Because Yunnan dialect belongs to Yunnan-Guizhou Plateau.

But I went to Kunming Changshui Airport.

I have never seen such a slogan.

I'm from the northeast.

There are many differences between Yunnan dialect and Northeast dialect.

So it can't be confused at all.