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简介：This lock lasted for hundreds of years, and the Manchu Qing Dynasty also continued this policy until the Opium War, when Westerners opened the door to China with strong ships and cannons. Facts have proved that closing the country to the outside world is an extremely stupid ostrich policy. Not only did it fail to maintain its status as a superior country, it also ruined its martial arts and made China lag behind the world in the concept of arrogance.