自然奇觀:北極驚現白色彩虹
Rare white rainbow lights up the North Pole.
罕見白色彩虹耀現北極。
This is the amazing moment a white rainbow streaks across the Arctic sky.
這絕對是驚人的一刻：白色彩虹橫跨北極上空。
The rare phenomena, named a fog bow, was spotted by Sam Dobson during a recent expedition to the North Pole.
這一罕見的自然現象叫做霧虹，是由山姆-杜布森在最近的一次北極探險中拍攝到的。
As their ice breaking ship cruised through the chilly waters, Sam clocked the arching rainbow but was stunned to see it was completely white.
山姆所乘坐的破冰船在寒冷的冰川中航行時，山姆被眼前的弧形彩虹給驚呆了，因爲這是一條純白色的彩虹。
A fog bow is a similar phenomenon to a rainbow, but it appears as an arch in fog rather than rain. And because of the very small size of water droplets that cause fog, smaller than 0.05 millimetres, it appears as a white arc, rather than a multi-coloured one.
霧虹和彩虹是相類似的自然現象，只不過霧虹是在霧中形成而非在雨中，而且由於水滴的大小不足0.05毫米，從而形成霧氣，造就了這輪白色彩虹，而不是常見的七色彩虹。
