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Hot dogs are also called frankfurters, or franks for short, named for the city of Frankfurt, Germany where sausages in a bun originated, similar to hot dogs, but made exclusively of pork. Another term for hot dogs is wieners or weenies, referring to the city of Vienna, Austria, whose German name is "Wien", home to a sausage made of a mixture of pork and beef.来自wiki的解释，看看就好。别想复杂了。