Few of us bothered to consider the numerous near-disasters during those successful flightssuch as engiues coming close to ecplosion before snuffing out in flight,last-second aborts on the launch pad,computer failures in orbit.

• 很少有人去费脑筋，去考虑在那些所谓大功告成飞行中出现的无数次险情，比如飞行中引擎在熄灭之前几乎要爆炸；发射架上最后一秒时，使发射击夭折；在轨道运行中计算机失灵，等等。