In this undated file photo, Jing Haipeng (center), Zhu Yangzhu (left) and Gui Haichao, three astronauts of China's Shenzhou XVI mission, receive training. (PHOTO BY XU BU / CHINA DAILY)

In this undated file photo, Jing Haipeng (left), Zhu Yangzhu (center) and Gui Haichao, three astronauts of China's Shenzhou XVI mission, receive training. (PHOTO BY XU BU / CHINA DAILY)

In this undated file photo, Jing Haipeng (center), Zhu Yangzhu (right) and Gui Haichao, three astronauts of China's Shenzhou XVI mission, receive training. (PHOTO BY XU BU / CHINA DAILY)

In this undated file photo, Zhu Yangzhu (left) and Gui Haichao (right) receive training. (PHOTO BY WANG XIAYANG / CHINA DAILY)

In this undated file photo, Gui Haichao (front right) and Jing Haipeng receive training. (PHOTO BY WANG XIAYANG / CHINA DAILY)

In this undated file photo, Jing Haipeng receives training for the Shenzhou XVI space mission. (PHOTO BY KONG FANGZHOU / CHINA DAILY)