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。

youdao

When there's a smaller gradient, air is often able to flow down from the Arctic.

而当它们之间只有一个较小的气压梯度时，风就能够经常从北极区向南吹。

youdao

As a soccer ball slows down after it's kicked in the air, the air flow around it changes from turbulent to smooth.

当球在空中速度减慢时，周围的气流从湍流变为稳定的层流。

youdao

What goes for an airport or a bay can be scaled up to an ocean, or the air above it, and down to the flow off an aircraft's wingtip, or a ship's hull.

ECONOMIST: Lagrangian coherent structures