Lockheed Martin revealed on Tuesday it is on the brink of a technological breakthrough that could lead to the US developing military aircraft that can fly six times the speed of sound.
洛克希德?馬丁公司(Lockheed Martin)周二披露，它即將取得一項(xiàng)技術(shù)突破，這項(xiàng)突破或會(huì)讓美國(guó)得以研發(fā)出能以6倍音速飛行的軍用飛機(jī)（上圖為設(shè)想圖）。
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