Aerial photo taken on March 10, 2018 shows a black-necked crane in Lhunzhub County, southwest China's Tibet Autonomous Region. 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/Purbu Zhaxi)
