LOS ANGELES, California -- NASA has made aeronautics history by launching an experimental jet that reached a record velocity of just over seven times the speed of sound.

It is the first time a supersonic-combustion ramjet, or scramjet, which uses air for fuel, had traveled so fast, flight engineer Lawrence Huebner told reporters.

词汇：
NASA
　国家航空航天局 National Aeronautics and Space Administration

aeronautics
　n.航空学, 航空术

velocity
　n.速度, 速率, 迅速, 周转率

supersonic
　n.超声波, 超声频
　adj.超音波的