Wind movements are also modified in cities because buildings increase the friction on air flowing around them.

风向在城市里也会改变，因为建筑物增加了它们周围流动的空气的摩擦力。

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Hot air flowing under the floor kept readers' feet warm.

地板下流动的热气使读者的脚保持温暖。

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The air flowing over a bird's wings curls upwards behind the wingtips, a phenomenon known as upwash.

流过鸟翅膀的空气在翼尖后向上流动，这种现象被称为上升流。

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This prevents air flowing through the lungs, causing breathing problems and sometimes damaging the lung tissues.

BBC: Gene key to baby chest infection

This is a large private lounge very centrally located on the second floor within the clubhouse, so you can watch races in the traditional fashion, from good open air box seats, then come in as often as you want between races for an air conditioned venue with open bar, free flowing food, live music, large screen and private betting terminals.

FORBES: Start Planning For 2013 Kentucky Derby Now

And although all participants get a chance to air their views, the meetings are hardly a free-flowing discussion.

ECONOMIST: The Federal Reserve