美国国家航空航天局今天在佛罗里达州宣布，已经取消了下一次的航天飞机任务。
NASA, the National Aeronautics and Space Agency, today announced in Florida that the next space shuttle mission has been canceled.
铝已经成为了许多火箭燃料小却关键的组成部分，包括航天飞机固体燃料推进火箭和国家宇航局下一代的Ares火箭。
Aluminum already represents a small but critical part of many rocket fuels, including the propellants for the space shuttle's solid booster rockets and NASA's next generation Ares rockets.
美国国家航空航天局计划再进行两次飞行——发现号和奋进号各一次——在两个航天飞机永远退役之前。
NASA plans to fly two more shuttle flights - on Discovery and Endeavour, respectively - before retiring the space shuttles for good.
应用推荐