Combo photo shows a view of Beijing Middle Road in Lhasa, southwest China's Tibet Autonomous Region in the 1980s (up, taken by Che Gang) and on Aug. 9, 2021(bottom, taken by Jigme Dorje) respectively. On May 23, 1951, the Agreement of the Central People's Government and the Local Government of Tibet on Measures for the Peaceful Liberation of Tibet (17-Article Agreement) was signed, officially proclaiming the peaceful liberation of Tibet. The year 2021 marks the 70th anniversary of the historic event. (Xinhua)