神舟12号圆满发射，聂海胜为何三度出征，而杨利伟却只上一次1

The successful launch of Shenzhou 12 saw veteran astronaut Nie Haisheng embarking on his third mission, while Yang Liwei, China"s first manned space traveler, remains on standby as part of the selection process for the flight crew. The mission marks a step in space station construction and highlights ongoing astronaut recruitment in China.