A solar-powered airliner is still a distant dream, but IATA knows that pushing the boundaries of technology will be necessary to help clean up air travel.

太阳能飞机依然是遥远的梦想，但IATA知道，推进科技界线必能协助清洁航空旅行。

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A big shift in passenger Numbers would be more likely if airlines had to pay the same taxes that train operators do, namely value-added tax and a tax on fuel, both of which would push up air fares.

乘客数量很有可能会大幅增长，如果航空公司不得不支付和列车经营者同样的税的话，也就是增值税以及燃油税，这两者都会提升飞机票价。

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Here it would reach supersonic speeds and then shift to its scramjet engine. The scramjet scoops up air and mixes it with fuel so it burns as the mixture flows through the engine at supersonic speeds.

这里它将达到超音速然后超高速冲压喷气发动机切换成工作状态，迎面气流进入发动机，与燃料混合，混合物在超音速状态流过引擎。

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Yet up at about five-thousand-four hundred meters the air pressure is only about half of what it is on the ground.

VOA: special.2011.04.06

Things are not "made up" in Frost, "not made up" in the sense of imagined, called up out of thin air, like fairies and elves.

弗罗斯特的诗歌里没有编造，没有想象，像仙女和精灵那样的凭空想象。

耶鲁公开课 - 现代诗歌课程节选

We're still close enough to the summer that the air is not just filling us up with extra static electricity, so it's a little more challenging here.

我们现在离夏天更近了,这样空气中不总是,充满额外的静电，所以这时做实验,会有一些挑战性。

麻省理工公开课 - 化学原理课程节选

But in a quiet corner of the show, a new way of clocking up air miles was to be found.

ECONOMIST: Safety

If there are thousands of these little aircraft buzzing around in the sky, will they terminally clog up air-traffic-control systems?

ECONOMIST: Travelling in an executive jet is just the ticket

Turning blades of the turbines mix up this air, cool with warmer, and thus lower the temperature of the higher up air.

FORBES: Wind Farms Cause Global Warming!