This is a warning story circulating in America. It tells the story of a soldier who went to a shoe store to buy shoes after returning to his hometown after the war. He only bought one shoe, but the owner of the shoe store said, "Brother Bing, I'm sorry, shoes are not just for sale!" " "But this soldier lost a leg in the war! There is only one foot left. What about two shoes? This means that people who enjoy peace don't know the dedication of soldiers who fight bloody battles at the front. I didn't understand the cruelty of war until I knocked on the door.

This sentence means "I don't know what understanding is", which is similar to "a strong woman in business hates her motherland".