Air resistance is directly proportional to the density of air you're moving through.

空气阻力与您所穿过的空气密度成正比。

If you've ever seen wavering distortions above a hot road, that fluttery mirage happens because different temperatures and densities of air bend light in different ways, like a fluid lens.

你有曾经在炎热的道路上见过起伏的扭曲，这种闪烁的海市蜃楼之所以会发生是因为不同的温度和密度空气以不同的方式弯曲光线，例如液体镜头。

As you go up, the density of air decreases and at 33,000 ft or 10 km, the density of air is just a third of what it is at sea level.

随着海拔高度上升， 空气密度逐渐降低， 在 33,000 英尺或 10 公里处，空气密度仅为海平面的三分之一。