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BEIJING,CHINA - DECEMBER 28:(COMPILATION) Quest for the unknown: China's aerospace milestones in 2021 on December 28, 2021 in Beijing, China. 2021 has witnessed China striding forward in its "space odyssey." The country aspires to further explore the vast unknown space at a faster pace.SOUNDBITE 1 (Chinese): Staff from control center. SOUNDBITE 2 (Chinese): ZHAI ZHIGANG, Chinese astronaut. SOUNDBITE 3 (Chinese): WANG YAPING, Chinese astronaut. SOUNDBITE 4 (Chinese): WU HAO, Head coach of Chinese astronauts' EVAs. SOUNDBITE 5 (Chinese): XIE ZHENGJIE, Student, Pui Kiu College, Hong Kong. SOUNDBITE 6 (Chinese): ZHAI ZHIGANG, Chinese astronaut. SOUNDBITE 7 (Chinese): ZHANG RONGQIAO, Chief designer of China's first Mars exploration mission. SOUNDBITE 8 (English): TREVOR IRELAND, Planetary science professor, The Australian National University. SOUNDBITE 9 (Chinese): WANG YAPING, Chinese astronaut. SOUNDBITE 10 (Chinese): BIAN HANCHENG, Deputy chief designer of landing site system of manned space program. SOUNDBITE 11 (Chinese): WU HUA, Commander Zero of Shenzhou-13 launch mission. SOUNDBITE 12 (Chinese): QI FAREN, Academician of the Chinese Academy of Engineering and former chief designer for Shenzhou spaceships. (Footage by Xinhua News Agency via Getty Images)