There have been two failures: The shuttle Challenger and seven astronauts were lost just after launch in January 1986 due to an O-ring seal leak in a solid rocket booster that led to an explosion.
有两次失败的教训：1986年1月刚刚发射过后，一个固体火箭助推器的O型圈密封泄漏导致的爆炸，使我们失去了挑战者号和7名宇航员。
However, after the Challenger shuttle was lost in an explosion in 1986, there was debate about what to do.
但是，由于1986年挑战者号航天飞机的失事，NASA内部关于备用配件的问题一直争论不休。
However, after the Challenger shuttle was lost in an explosion in 1986, there was debate about what to do.
但是，由于1986年挑战者号航天飞机的失事，NASA内部关于备用配件的问题一直争论不休。
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