translation.en: The military fighters had a -- highest-performance military airplane was the SR71. It went a whole life cycle, got too rusty to fly, and was taken out of service. The Concorde doubled the speed for airline travel.
translation.zh: 军事战斗机有一架最高性能的空军飞机 是SR71.它走过了整个生命周期，直到锈迹斑斑才停滞飞行， 退出服役。协和式飞机使空军旅行速度翻倍。