They all fought on two fronts, so why did the Germans fight for four years in World War I and failed in World War II for one year?

They all fought on two fronts, so why did the Germans fight for four years in World War I and failed in World War II for one year?
During World War I, Germany's opponent was Russia, which was weak in military strength.

in the first half of the 20th century, mankind experienced two worlds wars-World War I and World War II. Germany became the "core role" of the European battlefield in the two world wars, taking turns with the major European countries-France, Britain, Russia (the Soviet Union), and the United States from the other side of the ocean.

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