When the shape of a wing creates more lift from the air passing around it than it does drag (air resistance), an aircraft will fly.

当鱼鳍的形状通过流动的空气产生比其(空气)阻力更多的升力时，飞行物便能飞翔。

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Disrupted air, where the flow 'separates' from the body, creates turbulence which creates drag - which slows the car down.

与身体分隔的紊乱的空气产生涡流进而造成空气阻力，使得车速下降。

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If there were no air drag — remember we dropped - an apple early on from three meters — it will hit the floor at about 780 milliseconds.

如果没有空气阻力-，记得早些时候，我们从3m处扔苹果-，在780毫秒以后，会掉到地上。

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The engine constantly throttles up and down, not only to counter the drag on the satellite from residual air molecules in near space but also to smooth the flight of the vehicle to minimise the noise in the gravity measurements.

BBC: Goce gravity mapper surfs atmosphere