Combo photo shows boats made from cowhide carrying grain and products on the Yarlung Zangbo River in 1950s (up, photo taken by Zhao Qi) and a grand bridge over the Yarlung Zangbo River in Zhanang County of Shannan City, southwest China's Tibet Autonomous Region, Dec. 11, 2016 (bottom, photo taken by Purbu Zhaxi). 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)
