Introduction to the multi-dimensional demonstration hall: The multi-dimensional demonstration hall of the Memorial Hall is currently one of the largest spherical buildings in Asia, with a height of 43 meters and a diameter of 50 meters. The museum uses high-tech sound, light and electricity and diversified audio-visual art methods to combine the panoramic super-large screen Universal movies with background paintings and exhibition miniature landscapes to create a novel, unique and magnificent audio-visual art effect, shaping the The historical atmosphere of the multi-dimensional space of the Battle of Peking and Tianjin.