在阳光在雨水两次反射时，就可能发生双层彩虹。
Double rainbows occur when the sunlight is reflected twice inside the raindrops.
彩虹在自然界的模式。双层彩虹明亮在阿拉斯加的冻土原，部分中那里估计拥有数百万桶石油。
Patterns in Nature: Rainbows Rainbows brighten Alaska's tundra, parts of which are estimated to hold millions of barrels of oil.
彩虹在自然界的模式。双层彩虹明亮在阿拉斯加的冻土原，部分中那里估计拥有数百万桶石油。
Patterns in Nature: Rainbows Rainbows brighten Alaska's tundra, parts of which are estimated to hold millions of barrels of oil.
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