Introduction to Buick sedan: Buick sedan, license plate: Beijing 1645, was where Zhou Enlai waited during the negotiations between the Kuomintang and the Communist Party in Nanjing. During the Nanjing negotiations between the Kuomintang and the Communist Party, Zhou Enlai, Dong Biwu and others took this car to negotiate with the Kuomintang, and used this car to escort the party's underground workers and democrats many times. It has become an important teaching material for revolutionary traditional education and an important historical relic of the Nanjing negotiations between the Kuomintang and the Communist Party.