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More than 150 officials and scholars from 40 countries, regions and international organizations attended the symposium.
Xi stressed that international society has been devoted to boosting the agreement to become effective since it was signed in December 2015. China signed the agreement on April 22, the first day it was open to signature, and ratified it on Sept. 3.
Zhang Gaoli, vice premier and a member of the Standing Committee of the Political Bureau of the Communist Party of China (CPC) Central Committee, delivered a congratulatory message from the CPC Central Committee, the State Council and the Central Military Commission at the command center of China's manned space program in Beijing.
As a trailblazer for China-U.S. ties, Kissinger paid a secret visit to China in 1971 which paved way for the establishment of China-U.S. diplomatic ties in 1979.
Some new key technologies to support long-term manned space missions were tested in orbit, Huang said.
来源：资阳报