The mission by Fei and Nie, both former fighter pilots, is expected to be longer and riskier than the 2003 flight, which carried one astronaut and lasted just 21 1/2 hours.

• 费聂二人，都曾经是飞行员，这次任务比2003年的单人21。5小时飞行时间更长任务更艰巨。