As we come in to land, it's impossible not to note that Saigon's airport was obviously once much larger - the Outlines of buildings long gone are still clear from the air.

当飞临机场即将着陆时，不可能不注意到的是明显又大了许多的西贡机场——从空中也可以清晰地看见机场建筑物的轮廓。

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But it is worth remembering that just over a century ago, heavier-than-air flight seemed an impossible dream.

但是值得回忆的是仅仅在一个世纪以前，重于空气的飞行似乎是个不可能实现的梦想。

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For civilians or for soldiers on the battlefield, however, an SCBA system is nearly impossible to manage because of the expense and the limited air time.

对战场上的平民和士兵而言，由于价格昂贵、气量有限，SCBA系统几乎不可能达到预期效果。

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But the deeper lines are trickier: space is so tight that there is nowhere for waste heat to go, which makes traditional air-conditioning impossible.

ECONOMIST: London Underground

But it is worth remembering that just over a century ago, heavier-than-air flight seemed an impossible dream.

ECONOMIST: Electric planes

Heavier-than-air flying machines are impossible!

FORBES: Protect yourself from the dangers of conventional wisdom!