图片新闻【292】极超音速的巡航武器

The Pentagon is seeking to develop a drone in the next two decades that could strike any spot on Earth from the continental United States within two hours. The so-called Hypersonic Cruise Vehicle, which would be designed to hit targets about 9,000 miles away, should be available by about 2025. Hypersonic means traveling at more than five times the speed of sound. A hypersonic cruise missile engine is seen during testing on May 30, 2003 at NASA's Langley Research Center in Virginia. (Johns Hopkins-APL, DARPA, ONR, NASA/Reuters)

词汇：

pentagon n.五角大楼

drone n.雄蜂;无人驾驶飞机

so-called adj.所谓的, 号称的

hypersonic adj.极超音速的, 远超过音速的

cruise n.巡游, 巡航

NASA abbr.National Aeronautics and Space Administration (美国)国家航空和宇宙航行局