As an example, when I was in school, I was one of the few classmates who could speak the local dialect properly because the others' parents didn't speak it at home. I think dialect should be taught in schools along with "high" German so it doesn't disappear. At the same time it's important that kids learn the common language so they can communicate properly (and aren't made fun of or passed off as simpletons) outside their region.
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The same would apply to a common global language.