They glide on, the enormous multi-engined passenger jets, for thirty, forty-five minutes, only to smash themselves up when they attempt a landing.

它们，那些庞大的多引擎的客机，会继续滑行三、四十分钟，只是在它们企图着陆时才撞毁的。

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It was carried aloft by a converted Boeing 747 and used solely for glide-approach and landing tests.

它被一架改建的波音747型飞机抬到高处而且仅用于进场滑行和着陆试验。

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The pilot managed to glide the plane down to a safe landing.

飞行员使飞机向下滑翔而安全地着陆。

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The alert, initially issued by Southwest Airlines and reissued Wednesday by the airline's pilot association, warned there was a "potentially significant hazard" concerning the instrument landing system's glide slope guidance signal for runway 23.

CNN: Navigation alert went out to pilots weeks before Buffalo crash

When Jeffrey Skiles, the co-pilot of the plane that made an emergency landing in the Hudson River in January 2009, explained how he and his captain decided that an airport landing was impossible, he described the same "gaze heuristic": The angle of the plane's descending glide made the airport appear to rise in their windscreen view clearly signaling that a landing there was doomed.

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