Walking around the old city of Warsaw yesterday afternoon, the local tour guide had excellent Chinese, and the forum in the morning was translated by him. It was a historical control addicted to Polish history. He speaks highly of Poland's history between Russia and Germany. The old city of Warsaw was destroyed in World War II. In 44 years, the people of Warsaw rebelled against the Nazis and occupied the city for more than 60 days. Ultimately it failed. After the failure, the Nazis blew up the whole city and razed it to the ground. The old city is now rebuilt on detailed drawings after the war. There are Jewish settlements destroyed after the Nazi massacre, Madame Curie's former residence, the Polish palace where Chopin's heart is stored in pillars, and a tank track embedded in the wall for the deaths of innocent people after German tanks blow up residential areas. The Polish nation had suffered a lot and was deeply saddened. Now the country is developing well.