南极是地球上最适合进行这些观察工作的地方。首先，这里位于高原地区，大约有2英里的海拔高度；其次，空气中的水分很少，不至于对辐射造成扭曲。

The South Pole is the best place on the planet for these observations, as it's on a plateau that's almost 2 miles high, and the high, cold air contains very little radiation-distorting water vapor.

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有专家称，使用这种"超级扭曲"的方式，鸟类能够让空气从翼下划过，并能迅速减速并降低高度。

Using such twists and turns, birds are said to be able to spill air out of their wings and can slow down rapidly to reduce flight altitude.(See photo)

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提示：永远不要在背景上用渐变图层，因为当调整画布的高度时(网页设计时很常见的做法)，背景会被扭曲。

Tip: do not ever use a Gradient Layer for backgrounds, because when increasing the height of the canvas (a very common practice in web design) the background gets distorted.

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