what does this theory explains?
The Turkologist Gerhard Doerfer has denied any possibility of a relationship between the Xiongnu language and any other known language.
Xiongnu
The Turkologist Gerhard Doerfer has denied any possibility of a relationship between the Xiongnu language and any other known language. 
where is potassium located in the human body cells how does it react chemically? It is chemically very similar to sodium. what is its use in medication? It is used as a medication in the form of potassium chloride to treat and prevent low blood potassium. how does its cosmic formation happens? It is formed in supernovae by nucleosynthesis from lighter atoms. in which foods can you find it? yam, parsley, dried apricots, milk, chocolate, all nuts, etc. what are the types in which you can consume the fourth one? Milk consumption occurs in two distinct overall types: a natural source of nutrition for all infant mammals and a food product obtained from other mammals for consumption by humans of all ages can this food item possibly harm in any way? Milk and dairy products have the potential for causing serious infection in newborn infants what are some of its fermented products? sour cream, yogurt, cheese, buttermilk, viili, kefir, and kumis what is the last one's role in culture? During the Yuan Dynasty of China, it was essentially made to be the replacement of tea where did the term came from? It comes from the Turkic word "kımız". which places consume this? The drink remains important to the peoples of the Central Asian steppes, of Huno-Bulgar, Turkic and Mongol origin which ethnic group can you find within the people of former origin that you just mentioned? Xiongnu, Huns and Pannonian Avars, as well as Tuoba and Rouran from where did they originated? They belong to the Proto-Mongolic Donghu ancestry. which religion do they belong to? UNANSWERABLE can you name some of their foods? Manti what theory is related to the language of the first ethnic group of these people? Language isolate theories
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Xiongnu [SEP] Language isolate theories
The Turkologist Gerhard Doerfer has denied any possibility of a relationship between the Xiongnu language and any other known language. He also strongly rejected any connection with Turkic or Mongolian.