图片新闻【535】发现号航天飞机安全返回地球

The Space Shuttle Discovery is towed off the runway in Edwards Air Force Base in California August 9, 2005. The space shuttle Discovery and its seven astronauts returned to earth safely on Tuesday, successfully completing NASA's troubled resumption of human space flight 2.5 years after the Columbia disaster. Photo by Gene Blevins/Reuters

词汇：

space shuttle n.(往返于地球和太空站之间运载人和物资的)航天飞机
tow vt.拖, 曳, 牵引 vi.拖行, 被拖带
runway n.飞机跑道
astronaut n.太空人, 宇航员
NASA abbr.National Aeronautics and Space Administration (美国)国家航空和宇宙航行局
resumption n.再开始,(中断后)再继续