Upside down rainbows, or 'circumzenithal arcs', to give them the proper name, are not caused by rain.

倒挂的彩虹，或称“环天顶弧”，所以给它们这些正确的名称，并不是它们是由于下雨所造成的。

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A travel photographer captured this spectacular fire rainbow - a ' circumzenithal arc' - a phenomenon so rare he had to ask other experts what it was.

一位旅行摄影师拍摄到了壮观的着火了的彩虹奇观，这是罕见的“环天弧顶”现象。

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