The Dual Monarchy had existed for 51 years when it dissolved on October 31 , 1918 following military defeat in the First World War .
Austria-Hungary was the second largest country in Europe -LRB- after the Russian Empire -RRB- .
Austria-Hungary was the second largest country in Europe -LRB- after the Russian Empire -RRB- .
为该句子写一个更简单的版本: The Dual Monarchy had existed for 51 years when it dissolved on October 31 , 1918 following military defeat in the First World War . 输出: