the first US space shuttle (= spacecraft that can be used again). Its first flight was in 1981 with two astronauts, John Young and Robert Crippen. By 1996 Columbia had made 20 flights and that year made the longest one (more than 405 hours). In 2003 all seven of its crew members died when the space shuttle exploded as it was returning to earth. 哥伦比亚:美国第一架航天飞机。它的第一次飞行是在1981年,有两名宇航员,约翰·扬和罗伯特·克里彭。到1996年,哥伦比亚已经进行了20趟飞行,那一年飞行了最长的一次(超过405小时)。2003年,当航天飞机返回地球时爆炸时,所有七名机组人员死亡。