Hypersonic wind tunnels operating at very low densities were developed starting in about 1960.低密度超音速風洞大約開始發(fā)展于1960年.It would reach hypersonic speeds -- five times the speed of sound.也就是說,要使飛機達到特超音速—即音速的五倍.FEM FCT is used ...
Congress is empowered by the Constitution to make laws.國會由憲法授予制定法律的權(quán)限.The new law empowered the police to search private house.新法律給予警察搜查私人住宅的權(quán)利。The courts were empowered to impose the death sentence for certain crimes.法院...