1951年7月，进军西藏的解放军第十八军先遣支队行进在海拔5000米的冷拉雪山上。 （袁克忠 摄）

    Soldiers of a branch of China’s People’s Liberation Army march on the Lengla Snow Mountain at the altitude of 5000 meters. On May 23, 1951, the representatives of the central people’s government and Tibetan local government signed an agreement of peaceful liberation of Tibet which proclaimed Tibet was liberated in a peaceful way. （Photo by Yuan Kezhong）