But as more and more holidaymakers fly, rather than drive to and from their destinations, these liquid souvenirs are becoming a thing of the past.

但随着越来越多的度假者开始乘飞机，而不是驾车旅行，这些液体纪念品正在逐渐成为过去。

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For years it seemed that American consumers' demand for liquid fuel was price inelastic-whether it was to drive their cars or get their brains going in the morning.

这么多年来，美国消费者对液体燃料的需求似乎是没有价格弹性的——不管这个燃料是用来驱动汽车，还是用来在早上刺激大脑。

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By thronging together, they create large, liquid markets that drive down trading costs and reduce risks by allowing large deals to be handled.

通过邻近的办公地点，创造了巨大的流动市场，从而降低了交易成本，减少了大宗交易的风险。

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By thronging together, they create large, liquid markets that drive down trading costs and reduce risks by allowing large deals to be handled.

ECONOMIST: London as a financial centre

The idea of using a liquid with a lower boiling point than water to drive a turbine is nothing new it has simply not proved worthwhile in the past.

ECONOMIST: Geologists are getting more juice out of the ground

Drive the stream faster and the opposite happens: liquid separates, as it would in a centrifuge.

ECONOMIST: Acoustic microfluidics